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Security related tutorials

OpenSUSE

Block ssh brute force attack on OpenSuSe

Post date: June 27, 2009, 09:06 Category: Security Views: 3596 Comments
Tutorial quote: A brute force attack consists of trying every possible code, combination, or password until you find the right one.

As an example, imagine a system which only allows 4 digit PIN codes. This means that there are a maximum of 10,000 possible PIN combinations.
OpenSUSE

Highlight Domain & Subdomain for SSL websites in Firefox

Post date: May 27, 2009, 22:05 Category: Security Views: 3429 Comments
Tutorial quote: When you visit a Secure website in Firefox chances are that the FavIcon for the website is replaced with a Green bar with the details of the company. This is because of the default properties in Firefox to display detailed information of the website from the Extended Validation Certificate on the website. However, if the website doesn’t host a Extended Validation certificate then the website URL (link) in the address bar is not highlighted or in otherwords shows as a normal website URL.
OpenSUSE

Perfect Paper Passwords - One Time Password System (OpenSuse)

Post date: April 20, 2009, 09:04 Category: Security Views: 3472 Comments
Tutorial quote: Almost without exception, today's Internet users prove their identity online using a fixed account name and password. In the past, this simple system provided sufficient security. But with the growing popularity of online banking and eCommerce, the value of stealing online identities has skyrocketed. And the increasing presence and "spyware" and "malware" on innocent users' computers means that users can be "watched" while logging onto their banking and other eCommerce sites. Once their logon credentials have been "captured" and stolen, Internet criminals can easily assume their identity.
OpenSUSE

Removing Internet Junks (ads, banners, pop-ups, etc ..) using privoxy on OpenSuSe

Post date: April 20, 2009, 09:04 Category: Security Views: 3730 Comments
Tutorial quote: Privoxy is a Web proxy based on Internet Junkbuster with advanced filtering capabilities for protecting privacy, filtering Web page content, managing cookies, controlling access, and removing ads, banners, pop-ups, and other obnoxious Internet junk. Privoxy has a very flexible configuration and can be customized to suit individual needs and tastes. Privoxy is useful for both stand-alone systems and multi-user networks.
Linux

How to Create and Configure robot.txt for Apache web server

Post date: February 17, 2009, 08:02 Category: Security Views: 3248 Comments
Tutorial quote: "Robots.txt" is a regular text file that through its name, has special meaning to the majority of "honorable" robots on the web. By defining a few rules in this text file, you can instruct robots to not crawl and index certain files, directories within your site, or at all. For example, you may not want Google to crawl the /images directory of your site, as it's both meaningless to you and a waste of your site's bandwidth. "Robots.txt" lets you tell Google just that.
OpenSUSE

Encrypt-Decrypt files using mcrypt on OpenSuse

Post date: January 27, 2009, 07:01 Category: Security Views: 3248 Comments
Tutorial quote: MCrypt is a replacement for the old crypt() package and crypt(1) command, with extensions. It allows developers to use a wide range of encryption functions, without making drastic changes to their code. It allows users to encrypt files or data streams without having to be cryptographers. Above all, it allows you to have some really neat code on your machine. :)

The companion to MCrypt is Libmcrypt, which contains the actual encryption functions themselves, and provides a standardized mechanism for accessing them.
OpenSUSE

How to Enable-Disable Novell AppArmor on OpenSuse 11.1

Post date: January 27, 2009, 07:01 Category: Security Views: 3620 Comments
Tutorial quote: Novell AppArmor is configured to run by default on any fresh installation of openSUSE. There are two ways of toggling the status of AppArmor:
Linux

Block Spammers/Hackers With mod_defensible On Apache2

Post date: December 5, 2008, 12:12 Category: Security Views: 2796 Comments
Tutorial quote: mod_defensible is an Apache 2.x module intended to block spammers using DNSBL servers.

It will look at the client IP and check it in one or several DNSBL servers and return
a 403 Forbidden page to the client.
Linux

Configuring sudo and adding users to Wheel group

Post date: December 5, 2008, 12:12 Category: Security Views: 3342 Comments
Tutorial quote: f a server needs to be administered by a number of people it is normally not a good idea for them all to use the root account. This is because it becomes difficult to determine exactly who did what, when and where if everyone logs in with the same credentials. The sudo utility was designed to overcome this difficulty.
Ubuntu

Setting Up ProFTPd + TLS On Ubuntu 8.10 (Intrepid Ibex)

Post date: November 18, 2008, 12:11 Category: Security Views: 3482 Comments
Tutorial quote: FTP is a very insecure protocol because all passwords and all data are transferred in clear text. By using TLS, the whole communication can be encrypted, thus making FTP much more secure. This article explains how to set up ProFTPd with TLS on an Ubuntu 8.10 server.
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