Classic ASP

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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Classic ASP

<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<body>
<%
success = 0

'  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.

set ssh = Server.CreateObject("Chilkat.Ssh")

port = 22

'  The server must be connected, but not yet authenticated.
success = ssh.Connect("ssh.example.com",port)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

'  Returns a lowercase, comma-separated list, such as:
'      publickey,password,keyboard-interactive
authMethods = ssh.GetAuthMethods()
If (ssh.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Authentication methods supported by this server: " & authMethods) & "</pre>"

'  IMPORTANT: Querying the authentication methods intentionally disconnects from the server.
'  Reconnect before authenticating.
success = ssh.Connect("ssh.example.com",port)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
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.
password = "mySshPassword"

success = ssh.AuthenticatePw("mySshLogin",password)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "SSH authentication successful.") & "</pre>"

ssh.Disconnect 

%>
</body>
</html>