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SSH Public Key Authentication

Demonstrates authenticating with an SSH server using public-key authentication. A private key is loaded into an SshKey object and passed to AuthenticatePk. The matching public key must already be installed on the server for the account.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key never leaves the client, the server merely trusts the corresponding public key, and no reusable password crosses the wire. SshKey imports several formats — OpenSSH PEM keys via FromOpenSshPrivateKey and PuTTY .ppk files via FromPuttyPrivateKey — encrypted or not. For an encrypted key, set the Password property before importing. Note that LoadText is only a convenience for reading a text file into a string; it does not itself load the key.

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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 authenticating with an SSH server using public-key authentication.  The matching
;  public key must already be installed on the SSH server for the account.

$oSsh = ObjCreate("Chilkat.Ssh")

;  Timeouts, in milliseconds.
$oSsh.ConnectTimeoutMs = 5000
$oSsh.ReadTimeoutMs = 15000

Local $sHostname = "ssh.example.com"
Local $iPort = 22
$bSuccess = $oSsh.Connect($sHostname,$iPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  LoadText is a convenience method that reads any text file into a string.  It does not itself
;  load the key.
$oKey = ObjCreate("Chilkat.SshKey")
Local $sPrivKeyText = $oKey.LoadText("qa_data/my_private_key.pem")
If ($oKey.LastMethodSuccess = False) Then
    ConsoleWrite($oKey.LastErrorText & @CRLF)
    Exit
EndIf

;  Import the private key.  Both OpenSSH and PuTTY formats are supported, encrypted or not.
;  This example loads an unencrypted OpenSSH-format key; for a PuTTY .ppk file, call
;  FromPuttyPrivateKey instead.  For an encrypted key, set key.Password before importing.
$bSuccess = $oKey.FromOpenSshPrivateKey($sPrivKeyText)
If ($bSuccess = False) Then
    ConsoleWrite($oKey.LastErrorText & @CRLF)
    Exit
EndIf

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

ConsoleWrite("Public-key authentication successful." & @CRLF)

$oSsh.Disconnect