PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_SshJump
integer li_SshPort
string ls_Password
oleobject loo_SshTarget

li_Success = 0

//  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.

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 first SSH server (the jump host).
li_SshPort = 22
li_Success = loo_SshJump.Connect("jump.example.com",li_SshPort)
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("jumpUser",ls_Password)
if li_Success = 0 then
    Write-Debug loo_SshJump.LastErrorText
    destroy loo_SshJump
    return
end if

//  Connect to the target SSH server through the jump host.
loo_SshTarget = create oleobject
li_rc = loo_SshTarget.ConnectToNewObject("Chilkat.Ssh")

li_Success = loo_SshTarget.ConnectThroughSsh(loo_SshJump,"target.example.com",li_SshPort)
if li_Success = 0 then
    Write-Debug loo_SshTarget.LastErrorText
    destroy loo_SshJump
    destroy loo_SshTarget
    return
end if

//  Authenticate to the target server (separate credentials).
li_Success = loo_SshTarget.AuthenticatePw("targetUser",ls_Password)
if li_Success = 0 then
    Write-Debug loo_SshTarget.LastErrorText
    destroy loo_SshJump
    destroy loo_SshTarget
    return
end if

Write-Debug "Connected to the target through the jump host."

loo_SshTarget.Disconnect()
loo_SshJump.Disconnect()


destroy loo_SshJump
destroy loo_SshTarget