Perl

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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use strict;
use warnings;
use Chilkat2;

# 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.

my $tunnel = Chilkat2::SshTunnel->new;

# 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.
my $sshPort = 22;
my $success = $tunnel->Connect('ssh.example.com', $sshPort);
if (!$success) {
    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.
my $password = 'mySshPassword';

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

print "Authenticated.\n";

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

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