Perl

SSH Tunnel Authenticate with Password and Private Key

Demonstrates the Chilkat SshTunnel.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security deployments mandate two-factor SSH. This method satisfies that policy in one call, combining something you know (the password) with something you have (the key). The password should come from a secure source rather than a literal.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the SshTunnel.AuthenticatePwPk method, which authenticates with an SSH server that
# requires BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
# password, and the 3rd is an SshKey private key.

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';

# Load the SSH private key.  LoadText reads the file's text, which is then imported.
my $privKey = Chilkat2::SshKey->new;
my $keyText = $privKey->LoadText('qa_data/id_rsa');
if (!$privKey->LastMethodSuccess) {
    print $privKey->LastErrorText, "\n";
    exit;
}

$success = $privKey->FromOpenSshPrivateKey($keyText);
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

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

print "Authenticated with a password and a private key.\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;
}