tech.nocr.at » error

Sony Could Remotely Disable PS3s

Frank — Thu, 13 Jan 2011 00:30:24 +0000

Now that the PS3′s key have been leaked, its open territory for homebrew and hacking. Many people have been wondering what type of action Sony will be taking to combat this so called “piracy”. We have seen how ruthless they are with the PS3′s little brother the PSP and it’s no doubt that they will be just as ruthless with the PS3.

Digital Foundry claims that Sony can take some drastic measures including remotely disabling a jailbroken or hacked PS3. Even if you have never signed up for a PSN account, the PS3 communicates with the Sony mother-ship each time it’s turned on. The initial boot-up call back is used to upload error logs and download updates to the “What’s New” modules. It also sends a list of recently run apps.

Just that capability alone gives Sony a lot of power. Will they remotely disable systems? Who knows, but if they start to do that they open the door for some serious legal action. You know when the first PS3 that someone paid hundreds of dollars for gets killed and their unit is clean, Sony will be in a PR nightmare.

Sony Could Remotely Disable PS3s originally appeared on tech.nocr.at on 2011/01/12. Reproduction of content not allowed without consent.

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.

USB Prankster

Frank — Tue, 13 Oct 2009 04:40:50 +0000

This $32 USB device can easily cause some great laughs or it will cause you to be beaten senseless. Plus this flash drive looking USB device into an unsuspecting users computer and your victims computer will look like it’s possessed. Random mouse movements, caps lock turing itself off and on, or random garbled text and phrases. The Prankster also features a time delay switch so that you have time to make a getaway before all of the mayhem begins.

Although the unit is annoying it will never save a document or close out of anything. Still, make sure you know your victim well enough to know that he or she won’t be calling in the cops to investigate some terrorist action being performed on their computer.

You can try to pick this unit up (they are currently sold out) at Thumbs Up!

USB Prankster originally appeared on tech.nocr.at on 2009/10/13. Reproduction of content not allowed without consent.

Roll Your Own Error Messages

Frank — Fri, 26 Sep 2008 04:24:23 +0000

Have you ever actually run anything on the windows platform? Have you ever been puzzled by messages like these:

Across my stumbles of the great and vast internets I ran across the coolest website that can easily take hours away from your life. Atom Smasher‘s Make your own Error Message website is a great place to unwind and have fun with those pesky window pop up messages. You can create your own wacky windows error message, right down to what the buttons say and if they are grayed out or not.

Spook your co-workers with these gems and you’ll get hours of laughs. Enjoy

Roll Your Own Error Messages originally appeared on tech.nocr.at on 2008/09/26. Reproduction of content not allowed without consent.

AppleJack Goes Leopard

Frank — Tue, 02 Sep 2008 19:18:33 +0000

You might hope that you never need it, but if you ever run into a situation where your Mac doesn’t boot all the way to the Finder and you don’t have any boot capable utilities like Das Boot to fix your problem, AppleJack will be your best friend. AppleJack is a single-user-mode tool that is only available if you can boot your machine up in in single-user-mode by holding down Cmd-S. Once you get in it eases the process of checking your disk for any errors, permission problems, cleans your cache, gets rid of any problematic preference files, and deletes any corrupt swap data.

Many people feared that this great tool would never make the jump from Tiger to Leopard, as 10.5 make some charges that broke AppleJack’s functionality. Developer Steve Anthony took on the project of coding around the issues and giving the Mac community AppleJack back.

[Link to AppleJack]

AppleJack Goes Leopard originally appeared on tech.nocr.at on 2008/09/02. Reproduction of content not allowed without consent.

How To Speed Up WordPress With Nginx And WP Super Cache

Frank — Tue, 12 Aug 2008 03:43:16 +0000

Edit: Fixes suggested in the comments have been applied to this howto

We recently moved tech.nocr.at over to a bunch of VPSs in order to achieve some decent load balancing and speed. Even though SliceHost isn’t a sponsor, I’d like to give them a quick plug. SliceHost is easily the greatest VPS provider bar none. You pick the Distro you want, you tweak it, you set it up, all ports are available, you do as you wish. If you setup multiple VPS with them you can even have private IP’s between them in order to load balance or cluster. Prices start as low as $20/month. If you use them, click this link so that I can get some referral love. Now on to the article..

WordPress can be a blessing and a pain at the same time. It’s great for displaying dynamic content yet it’s displaying that exact dynamic content that can put a massive stress load on your system. WordPress’s query routines aren’t exactly the best. Let’s not even go into how much of a hog Apache can be, but for running dynamic content and prettying up your url’s, mod_rewrite can’t be beat. By using WP Super Cache to help reduce the load on your SQL queries and by placing Nginx in front of Apache as a reverse proxy, you’d be amazed and how quickly your site will load and respond, even enough to withstand a digg of slashdot effect.

Here’s what you are going to need.

This how-to system assumes that you have your Webserver running under a debian style distro like Ubuntu, but It can easily be modified for other distros like Fedora or CentOS.

Assuming that you already have WordPress running under Apache the first thing we are going to do is install the Wp-Super-Cache plugin and active it under your plugin folder of your WordPress installation. Pay close attention to the installation steps in the included readme.txt file, you have to follow each step properly in order to ensure proper caching.

Wp-Super-Cache creates static html files of your pages lessening the load on your SQL queries. Once you have it running and working let’s move on to our next step, reconfiguring Apache.

Apache can be a resource hog, especially when it has to span multiple child processes in order to serve up content. We are going to have to do some tweaking to apache’s conf file so that it will work behind Nginx.

Open up your /etc/apache2/ports.conf file

sudo nano /etc/apache2/ports.conf

We need to change Apache from port 80 to 8080 as Nginx will be server content to the real world via port 80.

Listen 8080

Next we are going to turn KeepAlives off on Apache since Nginx will be dealing with all of the actual browser connections. This will ensure that all of the child processes in Apache die quickly and don’t hang around chewing up memory

Find the KeepAlive entry in your /etc/apache2/apache2.conf file and set it to off

KeepAlive Off

Now that we have made the needed changes in apache we need to restart it so that they take effect.

sudo /etc/init.d/apache2 restart

Next we are going to install Nginx which is a powerful and extremely lightweight http server that is perfect for reverse proxying or load balancing to backend servers like Apache.

sudo apt-get update | sudo apt-get install nginx

Once nginx is installed we are going to need to modify it’s config file located at /etc/nginx/nginx.conf

sudo nano /etc/nginx/nginx.conf

Your conf file should look like this.

user www-data;
worker_processes  2;
 
error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;
 
events {
	worker_connections  1024;
}
 
http {
	include       /etc/nginx/mime.types;
	default_type  application/octet-stream;
	access_log  /var/log/nginx/access.log;
	sendfile        on;
	tcp_nopush     on;
	keepalive_timeout  3;
	tcp_nodelay        on;
	gzip  on;
	include /etc/nginx/sites-enabled/*;
}

Now we need to move on to the actual site config file for our Nginx setup

sudo nano /etc/nginx/sites-available/default

Your file should look something like this (replace domain.com of course)

server {
        listen   80;
        server_name  domain.com www.domain.com;
        error_log   /var/log/nginx/domain.com.error.log;
        access_log  /var/log/nginx/domain.com.access.log;
 
# Main location (path to you blog, relative to your domain root)
        location / {
            proxy_pass         http://127.0.0.1:8080/;
            proxy_redirect     off;
 
            proxy_set_header   Host             $http_host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
 
            client_max_body_size       10m;
            client_body_buffer_size    128k;
 
            proxy_connect_timeout      90;
            proxy_send_timeout         90;
            proxy_read_timeout         90;
 
            proxy_buffer_size          4k;
            proxy_buffers              4 32k;
            proxy_busy_buffers_size    64k;
            proxy_temp_file_write_size 64k;
        }
 
    # Static files location
        location ~* ^.+\.(htm|html|jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js)$ {
            root   /;
        }
	# if the requested file exists, return it immediately
	if (-f $request_filename) {
	break;
	}
 
	set $supercache_file '';
	set $supercache_uri $request_uri;
 
	if ($request_method = POST) {
	set $supercache_uri '';
	}
 
	# Using pretty permalinks, so bypass the cache for any query string
	if ($query_string) {
	set $supercache_uri '';
	}
 
	if ($http_cookie ~* "comment_author_|wordpress|wp-postpass_" ) {
	set $supercache_uri '';
	}
 
	# if we haven't bypassed the cache, specify our supercache file
	if ($supercache_uri ~ ^(.+)$) {
	set $supercache_file /wp-content/cache/supercache/$http_host/$1index.html;
	}
 
	# only rewrite to the supercache file if it actually exists
	if (-f $document_root$supercache_file) {
	rewrite ^(.*)$ $supercache_file break;
	}
}

The above (especially the if statements) help Ngnix pass the static html files that are created by WP Super Cache directly to the users thus freeing up Apache to do nothing more than handle the dynamic requests.

Now it’s time to restart Ngnix and get the whole ball of wax working

/etc/init.d/nginx restart

What we have essentially done is taken the load of serving static files like images, css, and js files off of apache and passed it on to Ngnix which runs a lot faster and leaner than apache for serving static content. All requests for any dynamic content like php still gets passed on to apache. Clean and simple.

In closing let me mention that this is just what works for me, i’m sure that there might be a better way to use WP Super Cache and Ngnix to speed up WordPress, but what you see above has really helped with the load on both of the tech.nocr.at front-end web servers.

How To Speed Up WordPress With Nginx And WP Super Cache originally appeared on tech.nocr.at on 2008/08/11. Reproduction of content not allowed without consent.

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Leopard On The EEEPC

Frank — Tue, 22 Jan 2008 21:41:54 +0000

I have written a lot about the Asus EEEPC. We even covered that crazy dude who put every possible hardware mod into the thing. Iâ€™ve had various flavours of Linux running, Windows, and yes ever Leopard (with a little hackintosh love).

When I decided to give Leopard a whirl on my tiny machine I followed Dan from Uneasy Silenceâ€™s guide on slapping Leopard on it. If you arenâ€™t a Mac lover he also has a guide on running Vista (although I can never figure out why you would want to) on your tiny device.

â€œSo, ever since I got the eeePC I’ve loved how easy it is to tinker with. Since I’m not a Linux guy, I dumped the Xandros preload and opted for Windows XP so I could you my EVDO USB datacard and blogging software easier, but I wondered could I install OSX on it? And, after trial and error – you can!â€

Link to loading Leopard
Link to loading Vista

Leopard On The EEEPC originally appeared on tech.nocr.at on 2008/01/22. Reproduction of content not allowed without consent.

14 Year Old Hacker Derails Train

Frank — Fri, 11 Jan 2008 20:33:45 +0000

I’m sure the media is going to put a nasty spin on this story about how all hackers are bad.

A 14 year old boy has been arrested after hacking into a Polish train system and using it like a giant train set which caused 12 people injuries. Initially it looked like he was being malicious, but I think it’s just the media trying to skirt the real problem; the kid was obviously bored and needed some form of stimulation. I’m sure the media is going to put a nasty spin on this story about how all hackers are bad.

“He had converted the television control into a device capable of controlling all the junctions on the line and wrote in the pages of a school exercise book where the best junctions were to move trams around and what signals to change.

“He treated it like any other schoolboy might a giant train set, but it was lucky nobody was killed. Four trams were derailed, and others had to make emergency stops that left passengers hurt. He clearly did not think about the consequences of his actions.”

Not that I am condoning this type of behaviour, but as we all know, curiosity sometimes gets the best of us. If anyone can gain that sort of access to public transport (with a modified TV remote control!) things are very wrong. What if it had been a terrorist? Iâ€™m sure it would be â€œdeadâ€ not â€œinjuredâ€ in the headlines.

Link to Full Story

14 Year Old Hacker Derails Train originally appeared on tech.nocr.at on 2008/01/11. Reproduction of content not allowed without consent.

Mac Error Confusion

Frank — Sun, 06 Jan 2008 05:11:21 +0000

Last month I was in Vancouver for a round of taping of the Lab with Leo Laporte TV show when this somewhat odd error window pop’s up on my screen.

“The wireless network appears to have been compromised and will be disabled for about a minute.”

I have never in my years seen this one, even had everyone on set stumped. Any ideas? I’d like to know if this has popped up on anyone else’s screen.

Mac Error Confusion originally appeared on tech.nocr.at on 2008/01/06. Reproduction of content not allowed without consent.

About

Frank — Mon, 24 Dec 2007 05:13:28 +0000

tech.nocr.at, founded on July 1, 2007, is a weblog dedicated to bringing you an unbiased clear cut view on all things related to technology. In addition, we bring you reviews of the hottest gadgets and gizmos. tech.nocr.at is edited by Frank Linhares and is currently seeking contributing editors. If your interested drop us a line with some sample work to jobs@tech.nocr.at

Frank Linhares (Founder, Managing Editor)

Frank Linhares, born and raised in the big smoke, Toronto, Ontario. ever since his younger years running around with a 300 baud modem he has always been at the bleeding edge of technology. be it the original newsgroups back in the day to bbs message networks. from good old school vax and unix hacking via war dialing, to being a 2600′er he’s been there doing what he can to advance the cause.

In 2005 Frank started the techPhile podcast and the simple reboot podcast. Since then he has moved on to co-host and produce a video show all about technology, Digital Underground.tv. Its a monthly tech based show covering news, view, and reviews in the world of tech. Frank has had the pleasure of interviewing many of the movers and shakers in the tech-world; Leo Laporte, Kevin Rose, Amber Macarthur, John C Dvorak, and Andy Walker just to name a few.

Frank has made guest appearances of the following programs talking about technology, new media and hacking: command-N, hak.5, This Week in Media, This Week in Tech, Lab Rats, and the Computer America radio show. Frank was also the regular hardware hacker on the Call for Help and Lab with Leo television shows which aired on TechTV in Canada and the US and on the How-To network in Australia.

Ethics

The tech.nocr.at editorial staff is bound by the following code of ethics:

Test the accuracy of information from all sources and exercise care to avoid inadvertent error. Deliberate distortion is never permissible.

Diligently seek out subjects of news stories to give them the opportunity to respond to allegations of wrongdoing.

Always question source motives before promising anonymity. Clarify conditions attached to any promise made in exchange for information. Keep promises.

Make certain that headlines, news teases and promotional material, photos, video, audio, graphics, sound bites and quotations do not misrepresent.

Never plagiarize.

Give voice to the voiceless; official and unofficial sources of information can be equally valid.

Distinguish between advocacy and news reporting. Analysis and commentary should be labeled and not misrepresent fact or context.

Distinguish news from advertising and shun hybrids that blur the lines between the two.

Avoid conflicts of interest, real or perceived.

Remain free of associations and activities that may compromise integrity or damage credibility.

Disclose unavoidable conflicts.

Deny favored treatment to advertisers and special interests and resist their pressure to influence news coverage.

Be open and honest about product reviews.

Be wary of sources offering information for favors or money; avoid bidding for news.

Admit mistakes and correct them promptly.

Abide by the same high standards to which they hold others.

About originally appeared on tech.nocr.at on 2007/12/24. Reproduction of content not allowed without consent.

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