tech.nocr.at » leech

Hotlink Prevention In Nginx

Frank — Mon, 03 Jan 2011 05:52:59 +0000

Hotlinking, inline linking, leeching, piggy-backing, direct linking or offsite image grabs. No matter what you call it 99% of the time it’s wrong. Bandwidth costs money. I spent sometime over the holidays examining my logs and noticed that there were a ton of sites hotlinking back to images we had posted. Worst of all, most of them were profiting off the images.

Here at tech.nocr.at we run nginx as a front-end proxy to WordPress. Stopping hotlinking in nginx is as simple as adding a small snippet of code in your sites-enabled file. Add the following code inside your server statement.

location ~* ^.+\.(jpg|jpeg|gif|png)$ {
  root   /path/to/webroot;
  valid_referers none blocked server_names ~(yourdomain.com|google.|yahoo.|bing.);
  if ($invalid_referer)  {
  return 403;
  }
}

The above will allow images to be displayed if they come from your domain, google, yahoo and bing. If you have other sites you might want your images to be linked from just add them in the valid_referers statement. If someone tries to hotlink to one of your images they will receive a 403 error. If you wish to have a different image displayed instead of the 403 error, letting them know they are hotlinking, then you must replace the return 403; line with this:

rewrite  ^  http://yourdomain.com/hotlink.jpe;

Notice how the image file ends in .jpe? If it were you end in .jpg it would end up in a loop and never be displayed. Simply create the image you want to use and change it’s extension to .jpe before you upload it to your web host.

Hotlink Prevention In Nginx originally appeared on tech.nocr.at on 2011/01/03. Reproduction of content not allowed without consent.

Top 10 Of 2010

Frank — Wed, 29 Dec 2010 05:51:37 +0000

Another year is almost behind us and thanks to our dedicated and loyal readers our 3rd successful year bringing you the latest in gadgets, gaming, technology and the bizarre.

We have brought the monkeys in (by monkeys we mean a crafty worded perl script) and have compiled the the most viewed posts here on tech.nocr.at. This list doesn’t just contain posts from 2010, it contains the top ten most viewed posts this year regardless of when they were created.

Without further ado, tech.nocr.at’s top 10 posts of 2010:

Let us know in the comments what were your favorite posts of 2010.

Top 10 Of 2010 originally appeared on tech.nocr.at on 2010/12/29. Reproduction of content not allowed without consent.

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Hunt Down Wi Fi Leeches With MoocherHunter

Frank — Wed, 15 Oct 2008 04:09:48 +0000

Last week we showed you how to screw with people who were stealing your Wi Fi signal by flipping their browsers and blurring their images. Today we show you how to hunt those Wi Fi moochers. The problem with leaving your Wi Fi unprotected is that malicious people can use it to download illegal files that can be tracked back to you. The best thing to do is lock down your Wi Fi to ensure that no one does something that you might be blamed for, but if you choose to leave it open and have a problem with a user or two taking advantage of it you can track them down and pay them a visit.

First thing you are gonna want to do is download MoocherHunter. MoocherHunter tracks the data that is being streamed from your unprotected Wi Fi right to their front door. The program is pretty straighforward to use and is part of a much larger wireless auditing toolkit called OSWA-Assistant which is chalked full of useful tools to make sure your Wi Fi is well protected.

Use this information wisely, don’t go out and do something stupid with it. Remember, this is to be used for personal research, not as an excuse to knock at someone’s door and start a fight.

Hunt Down Wi Fi Leeches With MoocherHunter originally appeared on tech.nocr.at on 2008/10/15. Reproduction of content not allowed without consent.

Baffle WiFi Leeches With An Upside-Down-Ternet

Frank — Wed, 08 Oct 2008 02:11:29 +0000

Have you ever had someone leach off your Wi Fi? You could always encrypt it or use any multitude of tricks to hide your network, but why would you do that when you can have some serious fun with them. Blur their images, or flip them upside down to get them really scratching their heads.

Essentially what you need to split up your net block so that you have a trusted block and an untrusted one. That coupled along with a few snippets of code will lead you to a wealth of possibilities. Imagine all the fun you could have with those neighbors who decide not to pay for their own access and ride the carpet on your hard earned dollars. Plus, it’s a whole lot of fun.

[Link to Upside-Down-Ternet]

Baffle WiFi Leeches With An Upside-Down-Ternet originally appeared on tech.nocr.at on 2008/10/07. Reproduction of content not allowed without consent.