PHP ActiveX

SSH Tunnel Authenticate with a Password

Demonstrates the Chilkat SshTunnel.AuthenticatePw method, which authenticates the SSH connection with a login name and password. The first argument is the login and the second is the password. Connect first, and call BeginAccepting afterward.

Background: Password authentication is the simplest option, but the password is a secret and should never be a hard-coded literal — obtain it from an interactive prompt, an environment variable, or a secrets vault. Public-key authentication is generally preferred for the unattended, long-running services that tunnels often are.

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<?php

$success = 0;

//  Demonstrates the SshTunnel.AuthenticatePw method, which authenticates the SSH connection with
//  a login name and password.  The 1st argument is the login and the 2nd is the password.

$tunnel = new COM("Chilkat.SshTunnel");

//  The tunnel forwards accepted local connections to this destination through the SSH server.
$tunnel->DestHostname = 'db.internal.example.com';
$tunnel->DestPort = 5432;

//  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
//  does not authenticate yet.
$sshPort = 22;
$success = $tunnel->Connect('ssh.example.com',$sshPort);
if ($success == 0) {
    print $tunnel->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';

$success = $tunnel->AuthenticatePw('mySshLogin',$password);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

print 'Authenticated.' . "\n";

//  After authenticating, call BeginAccepting to start listening for local connections to forward.

$waitForThreadExit = 1;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}


?>