Port Free Web Mail

**grand_witch** · 07-06-2004, 10:54 AM

Due to firewall setup at work I cannot access my web host provided webmail squirrel mail etc or cpanel. I use to use a script from hasweb.com but due to problems I have lost the script. I have tried to find a copy of it but cannot find it anywhere. I have found a program for accessing cpanel but not the webmail. Can anyone assist

**Paul Adams** · 07-06-2004, 03:03 PM

Is there a company policy against accessing all webmail?

If there isn't then I'd recommend contacting your network admin, and if there is then you shouldn't be trying to circumvent the policy!

**grand_witch** · 07-06-2004, 03:35 PM

I think its because port that the webmail uses is blocked. I have spoken to networks and it will remain blocked although there is no policy against webmail. This is why I have to find an alternative.

**Paul Adams** · 07-06-2004, 03:42 PM

Weird, I thought all webmail just used regular HTTPS on port 443.
You live & learn.

Do the webmail hosting company not have a FAQ on connectivity problems?
If they are using a nonstandard port then I would have thought they'd have had quite a few users potentially having problems.

**Barry** · 08-06-2004, 01:43 AM

Couple ways to do this.

1. This should be added to your apache.conf and ips changed..

Code:

 <VirtualHost 192.168.0.2:80>
ServerName cpanel.servername.co.uk
ProxyPass / http://192.168.0.1:1234
ProxyPassReverse / http://10.0.0.1:1234/
</VirtualHost>

2. alot easyer (can do it without asking for the apache.conf to be changed)

This goes in a .htaccess file

Code:

 RewriteEngine on
RewriteCond %{REQUEST_URI} !^/proxy.php
RewriteRule .* /proxy.php [last]

and call this proxy.php

Code:

<?php

//// Config

// Last part of hostnames
$hostpostfix = preg_replace('/^.*?\./', '', $_SERVER['HTTP_HOST']);

// First parts of hostnames
$webmailhost = 'webmail.'.$hostpostfix;
$cpanelhost = 'cpanel.'.$hostpostfix;
$whmhost = 'whm.'.$hostpostfix;

// The host where cPanel is running. I strongly suggest having this script on 
// the same server as cPanel, and leaving this setting at default "localhost".
$host = 'localhost';

// I'm honestly not sure if \r\n or \n is most correct, but in this case it 
// just needs to work.
$nl = "\r\n";

function error($header, $string) {
  echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Error</title>
</head>
<body>
<h1>Error: '.$header.'</h1>
'.$string.'
<hr />
<div style="font-size: 0.8em;"><a href="http://www.hosting-unlimited.net/">'
.'cPanel Proxy 0.2</a></div>
</body>
</html>
';
}

switch($_SERVER['HTTP_HOST']) {
 case $webmailhost:
   $port = 2095;
   break;
 case $cpanelhost:
   $port = 2082;
   break;
 case $whmhost:
   $port = 2086;
   break;
 default:
   error(
	 'Hostname not recognised','<p>Server is misconfigured or you have '
.'entered a wrong address. You can try these instead:</p>

<table>
<tr><td>Webmail: </td><td><a href="http://'.$webmailhost.'/">http://'
.$webmailhost.'/</a></td></tr>
<tr><td>cPanel: </td><td><a href="http://'.$cpanelhost.'/">http://'
.$cpanelhost.'/</a></td></tr>
<tr><td>WHM: </td><td><a href="http://'.$whmhost.'/">http://'.$whmhost
.'/</a></td></tr>
</table>
');
   exit;
}


//// Get headers from browser

// "/webmail" is replaced with "/webmail_" in the url, so the server won't
// redirect browsers using this proxy for webmail.
// The protocol is hardcoded to HTTP 1.0. Then we don't have to worry about
// chunked transfers, as 1.1 forces you to.
$frombrowser = $_SERVER['REQUEST_METHOD']." "
.str_replace('/webmail_', '/webmail',$_SERVER['REQUEST_URI'])." "
.'HTTP/1.0'.$nl;


foreach($_SERVER as $a=>$b) {
  if ($a == 'HTTP_HOST') $b = "$host:$port";
  if ($a == 'HTTP_CONNECTION') $b = "Close"; // FIXME: Maybe a persitent socket could be good for performance. Do we need to make sure only the same browser reuses a socket, or is persistent sockets as stateless as usual?
  if (substr($a,0,5)=='HTTP_') {
    $frombrowser .= substr($a,5)
      .': '. $b.$nl;
  }
}

// That was the regular headers. Now we need to re-generate the headers that 
// was parsed and thrown away before this scripts gets a chance to see them.

// First authentication.
if (isset($_SERVER['PHP_AUTH_USER']) 
    && !isset($_SERVER['HTTP_AUTHORIZATION'])) {
  $frombrowser .= "Authorization: Basic "
.base64_encode($_SERVER['PHP_AUTH_USER'].':'.$_SERVER['PHP_AUTH_PW']).$nl;
}

// End of browsers headers (for now).

switch($_SERVER['REQUEST_METHOD']) {

 case 'HEAD':
 case 'GET':
   // We're done, signalling this with an extra newline.
   $frombrowser .= $nl;
   break;

 case 'POST':
   // We probably have a body, we need to include this.
   
   $input = fopen('php://input','r');
   $frombrowser_body = '';

   if (strpos(@$_SERVER['CONTENT_TYPE'], 'multipart/form-data')===false) {

     // Not multipart/form-data, sending body directly from browser
     
     // First we get the entire post body.
     while (true) {
       $data = fread($input, 10240); // FIXME: Can we optimize here with another buffer-size?
       if (strlen($data)===0) break;
       $frombrowser_body .= $data;
     }
     
     if (strlen(@$_SERVER['CONTENT_TYPE'])) {
       $frombrowser .= "Content-Type: ".$_SERVER['CONTENT_TYPE'].$nl;
     }

   } else {

     // multipart/form-data
     
     $boundary = '--------'.md5(time()); // FIXME: Do we need a better algorithm to generate boundary string?
     $frombrowser .= "Content-Type: multipart/form-data; boundary="
       .$boundary.$nl;
     foreach($_POST as $name=>$data) {
       $frombrowser_body .= '--'.$boundary.$nl
	 .'Content-Disposition: form-data; name="'.$name.'"'.$nl
	 .$nl.$data.$nl; // FIXME: If $data is an array, handle that correctly.
     }

     foreach($_FILES as $name=>$data) {
       if (!is_uploaded_file($data['tmp_name'])) continue;

       $frombrowser_body .= '--'.$boundary.$nl
	 .'Content-Disposition: form-data; name="'.$name.'";'
	 .' filename="'.$data['name'].'"'.$nl; // FIXME: Do we need some kind of encoding here? What if the filename (or the name) has characters like double-quote, colon, semicolon, \n or \r?
       // (Uploading a file with double-quote in filename with Mozilla thru this script fails, I have not done any further testing yet.)
       $frombrowser_body .= 'Content-Type: '.$data['type'].$nl
	 .$nl
	 .file_get_contents($data['tmp_name'])
	 .$nl;
     }
     $frombrowser_body .= '--'.$boundary.$nl;
    }
   
   // Okay, now we can finish the headers and attach the body.
   $frombrowser .= "Content-Length: ".strlen($frombrowser_body).$nl
     .$nl
     .$frombrowser_body;

   break;

 default:
   error(
	 'Method not implemented',
	 '<p>Method '.$_SERVER['REQUEST_METHOD'].' not supported in cPanel '
.'Proxy, sorry.</p>'
	 );
   exit;
}

// Time to contact server and send request
$server = fsockopen($host, $port);
fputs($server, $frombrowser);


// Get server headers
while (true) {
  $data = fgets($server, 10240); // FIXME: Can we optimize here with another buffer-size?
  if (strlen(trim($data))==0) break;

  // Fix redirects, so browser keeps using proxy for webmail
  // I'm not sure if there's any redirects other than in webmail
  $data = str_replace(
		      'Location: http://localhost:2095',
		      'Location: http://'.$_SERVER['HTTP_HOST'],
		      $data);
  header($data);
}

if($_SERVER['REQUEST_METHOD']=='HEAD') {
  exit;
}

// Get server body
$data = '';
while (true) {
  $line = fgets($server, 10240); // FIXME: Can we optimize here with another buffer-size?
  if (strlen($line)===0) break;
  $data .= preg_replace('_("|=)/webmail_', '$1/webmail_', $line);
  // This has heavy influence on chunk-size (for HTTP/1.1 to browser)
  if (strlen($data)>10240) { // FIXME: Can we optimize here with another buffer-size?
    echo $data;
    flush();
    $data = '';
  }
}
// $data is probably not empty.
echo $data;
?>

**myplacedk** · 27-06-2004, 01:08 PM

That version of the script is old and has lots of bugs.
Go here to get the latest version: http://cpanelproxy.net/

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