Connect to an SSH Server Through Another (Jump Host)

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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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    success := 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.

    sshJump := chilkat.NewSsh()

    //  Connect and authenticate to the first SSH server (the jump host).
    sshPort := 22
    success = sshJump.Connect("jump.example.com",sshPort)
    if success == false {
        fmt.Println(sshJump.LastErrorText())
        sshJump.DisposeSsh()
        return
    }

    //  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("jumpUser",password)
    if success == false {
        fmt.Println(sshJump.LastErrorText())
        sshJump.DisposeSsh()
        return
    }

    //  Connect to the target SSH server through the jump host.
    sshTarget := chilkat.NewSsh()
    success = sshTarget.ConnectThroughSsh(sshJump,"target.example.com",sshPort)
    if success == false {
        fmt.Println(sshTarget.LastErrorText())
        sshJump.DisposeSsh()
        sshTarget.DisposeSsh()
        return
    }

    //  Authenticate to the target server (separate credentials).
    success = sshTarget.AuthenticatePw("targetUser",password)
    if success == false {
        fmt.Println(sshTarget.LastErrorText())
        sshJump.DisposeSsh()
        sshTarget.DisposeSsh()
        return
    }

    fmt.Println("Connected to the target through the jump host.")

    sshTarget.Disconnect()
    sshJump.Disconnect()

    sshJump.DisposeSsh()
    sshTarget.DisposeSsh()