PHP ActiveX

SSH Authenticate with a SecureString Password and Private Key

Demonstrates the Chilkat Ssh.AuthenticateSecPwPk method, which performs the same combined password/private-key authentication as AuthenticatePwPk but receives the username and password as SecureString objects. The third argument is the SshKey private key.

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

Background: This is the SecureString form of multi-factor SSH authentication: the password is held encrypted in memory and combined with a private key for servers that require both. It is the most protective option when a deployment mandates two-factor SSH and you also want to minimize plaintext credential exposure in the process.

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<?php

$success = 0;

//  Demonstrates the Ssh.AuthenticateSecPwPk method, which authenticates using SecureString login
//  and password objects together with a private key.  The 1st argument is the username, the 2nd
//  is the password, and the 3rd is an SshKey private key.

$ssh = new COM("Chilkat.Ssh");

//  Connect to the SSH server.  Port 22 is the usual SSH port.
$sshPort = 22;
$success = $ssh->Connect('ssh.example.com',$sshPort);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  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';

//  Load the SSH private key.  LoadText reads the file's text, which is then imported.
$privKey = new COM("Chilkat.SshKey");
$keyStr = $privKey->loadText('qa_data/id_rsa');
if ($privKey->LastMethodSuccess == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

$success = $privKey->FromOpenSshPrivateKey($keyStr);
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

//  Place the login and password into SecureString objects.
$secureLogin = new COM("Chilkat.SecureString");
$secureLogin->Append('mySshLogin');
$securePassword = new COM("Chilkat.SecureString");
$securePassword->Append($password);

$success = $ssh->AuthenticateSecPwPk($secureLogin,$securePassword,$privKey);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

print 'Authenticated.' . "\n";

$ssh->Disconnect();

?>