PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_SshJump
integer li_Port
string ls_Password
oleobject loo_Sftp

li_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.

loo_SshJump = create oleobject
li_rc = loo_SshJump.ConnectToNewObject("Chilkat.Ssh")
if li_rc < 0 then
    destroy loo_SshJump
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Connect and authenticate to the jump host first.
li_Port = 22
li_Success = loo_SshJump.Connect("jump.example.com",li_Port)
if li_Success = 0 then
    Write-Debug loo_SshJump.LastErrorText
    destroy loo_SshJump
    return
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.
ls_Password = "mySshPassword"

li_Success = loo_SshJump.AuthenticatePw("myJumpLogin",ls_Password)
if li_Success = 0 then
    Write-Debug loo_SshJump.LastErrorText
    destroy loo_SshJump
    return
end if

//  Connect to the SFTP server through the jump host.
loo_Sftp = create oleobject
li_rc = loo_Sftp.ConnectToNewObject("Chilkat.SFtp")

li_Success = loo_Sftp.ConnectThroughSsh(loo_SshJump,"sftp.internal.example.com",li_Port)
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_SshJump
    destroy loo_Sftp
    return
end if

//  Authenticate to the SFTP server (its own credentials), then initialize SFTP.
li_Success = loo_Sftp.AuthenticatePw("mySshLogin",ls_Password)
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_SshJump
    destroy loo_Sftp
    return
end if

li_Success = loo_Sftp.InitializeSftp()
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_SshJump
    destroy loo_Sftp
    return
end if

Write-Debug "Connected to the SFTP server through the jump host."

loo_Sftp.Disconnect()
loo_SshJump.Disconnect()


destroy loo_SshJump
destroy loo_Sftp