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Start SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how a tunnel supports two-factor and other challenge-response schemes. The returned XML says exactly what to ask and whether to mask the input.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  Demonstrates the SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive
#  authentication.  The only argument is the login name.  It returns XML describing the server's
#  prompts, which are answered with ContinueKeyboardAuth.

$tunnel = New-Object Chilkat.SshTunnel

#  The tunnel forwards accepted local connections to this destination through the SSH server.
$tunnel.DestHostname = "db.internal.example.com"
$tunnel.DestPort = 5432

#  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
#  does not authenticate yet.
$sshPort = 22
$success = $tunnel.Connect("ssh.example.com",$sshPort)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}

#  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
$infoRequestXml = $tunnel.StartKeyboardAuth("mySshLogin")
if ($tunnel.LastMethodSuccess -eq $false) {
    $($tunnel.LastErrorText)
    exit
}

$($infoRequestXml)

#  Answer the prompt(s) with ContinueKeyboardAuth, then call BeginAccepting.

$waitForThreadExit = $true
$success = $tunnel.CloseTunnel($waitForThreadExit)
if ($success -eq $false) {
    $($tunnel.LastErrorText)
    exit
}