VBScript

Connect to an SFTP Server Through a Jump Host

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

Background: This is the "jump host" (bastion) pattern: the application connects to a reachable gateway, then tunnels onward to an SFTP server that is only accessible from inside the network. Each hop authenticates separately with its own credentials. The result is a normal SFtp object — still requiring its own authentication and InitializeSftp — that happens to be routed through the first connection.

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VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set sshJump = CreateObject("Chilkat.Ssh")

'  Connect and authenticate to the jump host first.
port = 22
success = sshJump.Connect("jump.example.com",port)
If (success = 0) Then
    outFile.WriteLine(sshJump.LastErrorText)
    WScript.Quit
End If

'  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 = sshJump.AuthenticatePw("myJumpLogin",password)
If (success = 0) Then
    outFile.WriteLine(sshJump.LastErrorText)
    WScript.Quit
End If

'  Connect to the SFTP server through the jump host.
set sftp = CreateObject("Chilkat.SFtp")
success = sftp.ConnectThroughSsh(sshJump,"sftp.internal.example.com",port)
If (success = 0) Then
    outFile.WriteLine(sftp.LastErrorText)
    WScript.Quit
End If

'  Authenticate to the SFTP server (its own credentials), then initialize SFTP.
success = sftp.AuthenticatePw("mySshLogin",password)
If (success = 0) Then
    outFile.WriteLine(sftp.LastErrorText)
    WScript.Quit
End If

success = sftp.InitializeSftp()
If (success = 0) Then
    outFile.WriteLine(sftp.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Connected to the SFTP server through the jump host.")

sftp.Disconnect 
sshJump.Disconnect 

outFile.Close