(Classic ASP) SFTP Auth Failure Reason (AuthenticatePwPk)

This example demonstrates how to determine the failure reason for the case where both a password and private key are required for authentication. If authentication fails, was it because of an invalid private key, or an invalid password?

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

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

' Load a private key to be used for SSH authentication.
set key = Server.CreateObject("Chilkat.SshKey")
key.Password = "key_password"

success = key.FromOpenSshPrivateKey(key.LoadText("qa_data/my_private_key_file"))
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( key.LastErrorText) & "</pre>"
    Response.End
End If

set sftp = Server.CreateObject("Chilkat.SFtp")

success = sftp.Connect("sftp.example.com",22)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( sftp.LastErrorText) & "</pre>"
    Response.End
End If

' Authenticate using both a password and private key.
success = sftp.AuthenticatePwPk("myLogin","myPassword",key)
If (success = 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Authentication is successful!") & "</pre>"
    Response.End
End If

' If we get here, it means the authentication failed.
' Examine the last JSON data..

set json = Server.CreateObject("Chilkat.JsonObject")
sftp.GetLastJsonData json

json.EmitCompact = 0

' This is the JSON if the key is correct, but the password is incorrect:

' {
'   "public_key_type": "rsa",
'   "partialAuthResult": "publickey success. continue to authenticate with password...",
'   "authResult": "failed",
'   "authFailReason": "Password is incorrect"
' }

' This is the JSON if the key is incorrect.  We won't know if the password is also incorrect until
' the key is made correct so that authentication proceeds to check the password.

' {
'   "public_key_type": "rsa",
'   "authResult": "failed",
'   "authFailReason": "Key is incorrect"
' }

' To get the authResult anbd authFailReason:
Response.Write "<pre>" & Server.HTMLEncode( "authResult: " & json.StringOf("authResult")) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "authFailReason: " & json.StringOf("authFailReason")) & "</pre>"

%>
</body>
</html>