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Security related tutorials

Ubuntu

Setting Up ProFTPd + TLS On Ubuntu 11.04 (Natty Narwhal)

Post date: September 27, 2011, 07:09 Category: Security Views: 3220 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 11.04 server.
Debian

PHP-FPM/Nginx Security In Shared Hosting Environments (Debian/Ubuntu)

Post date: September 25, 2011, 16:09 Category: Security Views: 4825 Comments
Tutorial quote: If you want to use nginx and PHP-FPM for shared hosting environments, you should make up your mind about security. In Apache/PHP environments, you can use suExec and/or suPHP to make PHP execute under individual user accounts instead of a system user like www-data. There's no such thing for PHP-FPM, but fortunately PHP-FPM allows us to set up a "pool" for each web site that makes PHP scripts execute as the user/group defined in that pool. This gives you all the benefits of suPHP, and in addition to that you don't have any FTP or SCP transfer problems because PHP scripts don't need to be owned by a specific user/group to be executed as the user/group defined in the pool.
Debian

Host Based Intrusion Detection - Samhain

Post date: January 19, 2011, 12:01 Category: Security Views: 3777 Comments
Tutorial quote: This article describes in some detail how to install Samhain, the host based intrusion detection system. I am not going to ramble on about what host based intrusion detection is or why to use it, as there are plenty of articles already covering those subjects. This article is just to show you how to get Samhain up and running in a client / server configuration with a couple bells and whistles thrown in for fun.
Ubuntu

Recover deleted files from NTFS filesystem from Ubuntu Linux - Ntfsundelete

Post date: October 10, 2010, 05:10 Category: Security Views: 3930 Comments
Tutorial quote: If you have accidentally deleted files from your hard drive, don't panic! You can easily recover deleted files whether you are using a Windows PC (NTFS) or Linux OS. You can undelete files with almost guaranteed success. The most important thing is to act as soon as you realize that the files are lost.
Debian

How To Integrate ClamAV Into PureFTPd For Virus Scanning On Debian Lenny

Post date: April 19, 2010, 08:04 Category: Security Views: 4009 Comments
Tutorial quote: This tutorial explains how you can integrate ClamAV into PureFTPd for virus scanning on a Debian Lenny system. In the end, whenever a file gets uploaded through PureFTPd, ClamAV will check the file and delete it if it is malware.
Linux

Block Ads / Malware / Spyware using hosts file (Windows / Linux)

Post date: January 24, 2010, 06:01 Category: Security Views: 4180 Comments
Tutorial quote: The most easy way to block advertisements and other malware sites is to point those site to ip address 127.0.0.1 or 0.0.0.0 (however the zero version may not be compatible with all systems) in your hosts file.
Linux

Recursively Encrypt / Decrypt Directories using gpgdir on Linux

Post date: January 24, 2010, 06:01 Category: Security Views: 4378 Comments
Tutorial quote: gpgdir is a script that encrypts and decrypts directories using a GPG key. It supports recursively descending through a directory in order to make sure it encrypts or decrypts every file in a directory and all of its subdirectories.
Linux

shred - Securely delete files in Linux

Post date: January 24, 2010, 06:01 Category: Security Views: 3995 Comments
Tutorial quote: In case you want to delete some confidential data from your computer just to make sure that it is no longer accessible to anyone, then do not delete the file using the regular rm command because there will still remain a chance that someone might use a software to recover your deleted data before the specific storage area is overwritten by new data. The proper way to permanently dispose of such data in Linux is the shred command.
Debian

Setting Up ProFTPd + TLS On Debian Lenny

Post date: July 30, 2009, 15:07 Category: Security Views: 4147 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 a Debian Lenny server.
Linux

Setting the SUID/SGID bits

Post date: June 27, 2009, 09:06 Category: Security Views: 4231 Comments
Tutorial quote: SetUID bit, the executable which has the SUID set runs with the ownership of the program owner. That is, if you own an executable, and another person issues the executable, then it runs with your permission and not his. The default is that a program runs with the ownership of the person executing the binary.
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