PHP

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

use Chilkat2\SshTunnel;

// 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 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;
try {
    $tunnel->Connect('ssh.example.com', $sshPort);

    // 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';

    $tunnel->AuthenticatePw('mySshLogin', $password);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Authenticated.\n";

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

$waitForThreadExit = true;
try {
    $tunnel->CloseTunnel($waitForThreadExit);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}