Use PHP as a doorway

[whipper]

Ok, I'm on a school network that is not using a Proxy but an automatic configuration script for the proxy. I have a computer on one network running apache and php and can surf the web. If I go to a computer in one classroom that is on a different network they have forbidden internet access and the ability to change any of the settings.
Is it possible to setup the computer running PHP to be a doorway to the internet where I open a PHP file on that computer using the other computer's IE browser and jump link to link?
The concept is like how Babble Fish (altavistata) translates websites itot different languages without leaving their site.
Thanks

🙂

[CaptianChaos]

Ahhh, now you're talking, you want to cause Chaos, I love it. Since I am the Captain of Chaos, let me show you how to do this:

yourphpfile.php on network1:

<?php
if ($_GET['url']) {
    $lines = @file($_GET['url']);
    if ($lines) {
      print implode("", $lines);
    }
    else {
      print "Could not fetch: ".$_GET['url'];
    }
}
else {
  ?>
   <form method="GET">
   Type the URL you want to go to (inlude [url]http://[/url] or it
won't work).  Also, if you want [url]http://www.yahoo.com/[/url] 
make sure you have the trailing slash at the end.  [url]
[url]http://www.yahoo.com[/url][/url] won't work as good as [url]
[url]http://www.yahoo.com/[/url][/url]
   Url: <input type="text" size="30" name="url" value="http://">
   <input type="submit" value="Go">
  </form>
  <?php
}
?>

Then, from network2 browser:
http://network1/yourphpfile.php

You type the URL you want to see, it show you. You will not see any graphics, links won't work, but you will be fetching the HTML for the URL you type. Now don't get in too much trouble with this!

[CaptianChaos]

Since you seem to have access to a computer on the network that is not restricted, have you considered running proxy software on the computer you have access to? You could then use computer2, configure IE to use a proxy server, put in the IP address of computer1 as the proxy server, and you're on the web without restrictions.

[dalecosp]

I believe you could set up Apache to do the proxy work for you.

Apache as a proxy server (DevShed)

Bandwidth for all! Freedom via ether!!!!

🙂

[FrozNic]

proxy works best in this situation, but man have i thought alot about this one back in my day 🙂 im thinking it's a reg code that gives certain users permission for certain things.. probly a pol file that sets up restrictions for certain users... OR maybe it's just script on the server that checks the username of the person using the net. either way, u may be able to get around the prob by the machine that is blocked... sure, you can go around it numerous ways, but, every possiblity is fun to explore. maybe spoof who u are somehow? i'm not sure exactly! i liked ur idea the best, create a backdoor on the server side, so that u can port out to wherever u want to go. basically all u need is something that caches ur pages so u can view the whole page, i'm not sure if this is completly possible in php alone, ur going to need some prog to d/l the http and any info the page needs if it's dynamic, say you have to pass data like in a text box (for logging in) u have to send info back and forth from client to server more then once during an http session... anyway, just some thoughts.. bi

[CaptianChaos]

dalecosp - Great link! Step by step guide to setting up Apache as a proxy server. Awesome!

The school is disabling web surfing altogether on network2, probably blocking all outgoing traffic on port 80 and 443 from the IP range on network2 at the firewall level. Solution is simple: setup a proxy server on a server on network1, which is not blocked, and presto, you're surfing the web in English class! I guess that whipper is a high school student looking for a way to surf the web in a classroom not meant to be allowed to surf the web. If whipper figures out how to setup a proxy server on network1 so he can surf the net while in another classroom, he'll probably get suspended, detention at least. But I say it's well worth the punishment! The knowledge he will gain from doing it will far outweigh the consequences of the punishment. So, whipper, my advice, go for it... see how long you can get away with it, brag to all your friends, get caught, stand tall and take the punishment without shame.

[wreed]

Originally posted by CaptianChaos
Ahhh, now you're talking, you want to cause Chaos, I love it. Since I am the Captain of Chaos, let me show you how to do this:

yourphpfile.php on network1:

<?php
if ($_GET['url']) {
    $lines = @file($_GET['url']);
    if ($lines) {
      print implode("", $lines);
    }
    else {
      print "Could not fetch: ".$_GET['url'];
    }
}
else {
  ?>
   <form method="GET">
   Type the URL you want to go to (inlude [url]http://[/url] or it
won't work).  Also, if you want [url]http://www.yahoo.com/[/url] 
make sure you have the trailing slash at the end.  [url]
[url]http://www.yahoo.com[/url][/url] won't work as good as [url]
[url]http://www.yahoo.com/[/url][/url]
   Url: <input type="text" size="30" name="url" value="http://">
   <input type="submit" value="Go">
  </form>
  <?php
}
?>

Then, from network2 browser:
http://network1/yourphpfile.php

You type the URL you want to see, it show you. You will not see any graphics, links won't work, but you will be fetching the HTML for the URL you type. Now don't get in too much trouble with this! [/B]

This will work wonders for a firewall too right? Errr or a server that collects internet traffic?

[FrozNic]

captains got my vote 🙂 it's well worth it! even getting that look from your mom thats like, son, i really really disaprove of what you're doing but i love u anyway 😛 it's all still worth it 🙂

[CaptianChaos]

... and after your punishment is over, they'll probably hire you to figure out how to keep other people from doing what you did.

[whipper]

Originally posted by CaptianChaos
Ahhh, now you're talking, you want to cause Chaos, I love it. Since I am the Captain of Chaos, let me show you how to do this:

yourphpfile.php on network1:

<?php
if ($_GET['url']) {
    $lines = @file($_GET['url']);
    if ($lines) {
      print implode("", $lines);
    }
    else {
      print "Could not fetch: ".$_GET['url'];
    }
}
else {
  ?>
   <form method="GET">
   Type the URL you want to go to (inlude [url]http://[/url] or it
won't work).  Also, if you want [url]http://www.yahoo.com/[/url] 
make sure you have the trailing slash at the end.  [url]
[url]http://www.yahoo.com[/url][/url] won't work as good as [url]
[url]http://www.yahoo.com/[/url][/url]
   Url: <input type="text" size="30" name="url" value="http://">
   <input type="submit" value="Go">
  </form>
  <?php
}
?>

Then, from network2 browser:
http://network1/yourphpfile.php

You type the URL you want to see, it show you. You will not see any graphics, links won't work, but you will be fetching the HTML for the URL you type. Now don't get in too much trouble with this! [/B]

Thanks for your help, but all I got was a blank screen. There was nothing in the BODY and didn't display the

[whipper]

Originally posted by whipper
Thanks for your help, but all I got was a blank screen. There was nothing in the BODY and didn't display the

This works for the local files, just not any external sites. There must be some cinfiguration issue with Apache webserver that is not allowing PHP to go external. I'm checking on this.
Thanks, 🙂

[dalecosp]

Actually, I'm not sure if file() can be called on externals, Apache or no. I'm pretty sure fopen() can, (so why not file(), like I said, I dunno) but there is a config option in PHP.ini that affects whether or not fopen() can handle externals.

There was a thread here about this not long ago, you might search the forum...

[CaptianChaos]

The script I posted I tested with my own machine, file() function does work on external files.

If safe_mode is on in the php.ini file, external calls will be disabled.