Perl

SSH Through a SOCKS Proxy

Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy. Set the SOCKS properties before calling Connect, and set SocksVersion to match the proxy server.

Background: SOCKS is a general-purpose TCP relay, so unlike an HTTP proxy it is designed from the start to carry arbitrary protocols — usually the smoother option for SSH. The version matters: SOCKS4 supports only a username with no password, while SOCKS5 supports full login/password authentication as well as IPv6 and remote DNS resolution. Note this is the inverse of dynamic port forwarding: here a SOCKS proxy is used to reach the SSH server, rather than SSH providing a SOCKS proxy.

Chilkat Perl Downloads

Download Chilkat for Perl

Perl

use chilkat();

$success = 0;

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy.

$ssh = chilkat::CkSsh->new();

#  Set the SOCKS proxy properties before connecting.  The hostname may be a domain name or an
#  IP address.
$ssh->put_SocksHostname("socks.example.com");
$ssh->put_SocksPort(1080);
$ssh->put_SocksUsername("mySocksLogin");
$ssh->put_SocksPassword("mySocksPassword");

#  Set the version to match the proxy server: 4 or 5.
#  Note: SOCKS4 supports only a username, with no password.  SOCKS5 supports full
#  login/password authentication.
$ssh->put_SocksVersion(5);

$hostname = "ssh.example.com";
$port = 22;
$success = $ssh->Connect($hostname,$port);
if ($success == 0) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

print "Connected to the SSH server through the SOCKS proxy." . "\r\n";

#  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 = $ssh->AuthenticatePw("mySshLogin",$password);
if ($success == 0) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

#  ... use the SSH connection normally ...

$ssh->Disconnect();