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Get SSH Server Authentication Methods

Demonstrates getting the authentication methods advertised by an SSH server. Connect first but do not authenticate, then call GetAuthMethods, which returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive.

Important: Querying the authentication methods intentionally disconnects from the server, so reconnect before authenticating.

Background: Knowing what a server accepts lets a client choose the right authentication path rather than guessing — for example, falling back to keyboard-interactive when password authentication is not offered, or failing fast with a clear message when only public-key is allowed. It is also useful diagnostically when authentication fails for reasons that are not obvious from the error text.

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Local $bSuccess = False

;  This example requires the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

;  Demonstrates getting the authentication methods advertised by an SSH server.

$oSsh = ObjCreate("Chilkat.Ssh")

Local $iPort = 22

;  The server must be connected, but not yet authenticated.
$bSuccess = $oSsh.Connect("ssh.example.com",$iPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Returns a lowercase, comma-separated list, such as:
;      publickey,password,keyboard-interactive
Local $sAuthMethods = $oSsh.GetAuthMethods()
If ($oSsh.LastMethodSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Authentication methods supported by this server: " & $sAuthMethods & @CRLF)

;  IMPORTANT: Querying the authentication methods intentionally disconnects from the server.
;  Reconnect before authenticating.
$bSuccess = $oSsh.Connect("ssh.example.com",$iPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
Local $sPassword = "mySshPassword"

$bSuccess = $oSsh.AuthenticatePw("mySshLogin",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("SSH authentication successful." & @CRLF)

$oSsh.Disconnect