PHP ActiveX

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.

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<?php

$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 = new COM("Chilkat.Ssh");

//  Set the SOCKS proxy properties before connecting.  The hostname may be a domain name or an
//  IP address.
$ssh->SocksHostname = 'socks.example.com';
$ssh->SocksPort = 1080;
$ssh->SocksUsername = 'mySocksLogin';
$ssh->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->SocksVersion = 5;

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

print 'Connected to the SSH server through the SOCKS proxy.' . "\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 . "\n";
    exit;
}

//  ... use the SSH connection normally ...

$ssh->Disconnect();

?>