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Security related tutorials

Ubuntu

Using Steghide to Hide your Data Crypticly

Post date: November 24, 2007, 22:11 Category: Security Views: 5273 Comments
Tutorial quote: By using Steghide, we can embed hidden files inside of other files and the average person will never know. This method also encrypts the hidden data, so a password will be required to extract and view whatever is hidden. The method is referred to as steganography.
Ubuntu

Intrusion Detection: Snort, Base, MySQL, and Apache2 On Ubuntu 7.10 (Gutsy Gibbon)

Post date: November 21, 2007, 10:11 Category: Security Views: 4768 Comments
Tutorial quote: In this tutorial I will describe how to install and configure Snort (an intrusion detection system (IDS)) from source, BASE (Basic Analysis and Security Engine), MySQL, and Apache2 on Ubuntu 7.10 (Gutsy Gibbon). Snort will assist you in monitoring your network and alert you about possible threats. Snort will output its log files to a MySQL database which BASE will use to display a graphical interface in a web browser.
OpenSUSE

Preventing Brute Force Attacks With Fail2ban On OpenSUSE 10.3

Post date: October 15, 2007, 06:10 Category: Security Views: 5850 Comments
Tutorial quote: In this article I will show how to install and configure fail2ban on an OpenSUSE 10.3 system. Fail2ban is a tool that observes login attempts to various services, e.g. SSH, FTP, SMTP, Apache, etc., and if it finds failed login attempts again and again from the same IP address or host, fail2ban stops further login attempts from that IP address/host by blocking it with an iptables firewall rule.
Debian

Preventing Brute Force Attacks With BlockHosts On Debian Etch

Post date: September 30, 2007, 09:09 Category: Security Views: 3943 Comments
Tutorial quote: In this article I will show how to install and configure BlockHosts on a Debian Etch system. BlockHosts is a Python tool that observes login attempts to various services, e.g. SSH, FTP, etc., and if it finds failed login attempts again and again from the same IP address or host, it stops further login attempts from that IP address/host. By default, BlockHosts supports services that use TCP_WRAPPERS, such as SSH, i.e. services, that use /etc/hosts.allow or /etc/hosts.deny, but it can also block other services using iproute or iptables.
Debian

Checksecurity

Post date: September 25, 2007, 18:09 Category: Security Views: 2914 Comments
Tutorial quote: Checksecurity does some very basic system security checks,such as looking for changes in which programs have setuid permissions, and that remote filesystems are not allowed to have runnable setuid programs.
Ubuntu

Virus Protection With F-PROT Antivirus On Ubuntu Feisty Fawn

Post date: September 24, 2007, 08:09 Category: Security Views: 3668 Comments
Tutorial quote: This tutorial shows how you can install and use F-PROT Antivirus on an Ubuntu Feisty Fawn desktop. Although there are not many Linux viruses out there, this can be useful if you often exchange files with Windows users - it can help you to not pass on any Windows viruses (that do not do any harm to Linux systems) to Windows users. F-PROT Antivirus for Linux is free for home use.
Debian

Chrooted SFTP With MySecureShell On Debian Etch

Post date: September 19, 2007, 22:09 Category: Security Views: 4057 Comments
Tutorial quote: This tutorial shows how to install MySecureShell on a Debian Etch system. MySecureShell is an SFTP server that is based on OpenSSH and can be configured in many ways, e.g. it has support for chrooting users into their homedirs or for limiting upload-/download bandwidths. MySecureShell makes SFTP available for users that do not have shell access so that these users do not have to use the insecure FTP protocol anymore.
Ubuntu

Virus Protection With AVG Antivirus On Ubuntu Feisty Fawn

Post date: September 10, 2007, 22:09 Category: Security Views: 3768 Comments
Tutorial quote: This tutorial shows how you can install and use AVG Antivirus on an Ubuntu Feisty Fawn desktop. Although there are not many Linux viruses out there, this can be useful if you often exchange files with Windows users - it can help you to not pass on any Windows viruses (that do not do any harm to Linux systems) to Windows users. AVG Antivirus for Linux is free for private and non-commercial use.
Debian

Chrooted SSH/SFTP Tutorial (Debian Etch)

Post date: September 7, 2007, 22:09 Category: Security Views: 3809 Comments
Tutorial quote: This tutorial describes two ways how to give users chrooted SSH access. With this setup, you can give your users shell access without having to fear that they can see your whole system. Your users will be jailed in a specific directory which they will not be able to break out of. The users will also be able to use SFTP in their chroot jails.
Debian

ASSP With Embedded ClamAV Integrated Into Postfix With Virtual Users And Domains

Post date: September 5, 2007, 01:09 Category: Security Views: 3573 Comments
Tutorial quote: This document describes how to integrate ASSP (Anti-Spam SMTP Proxy) with embedded ClamAV into a mail server based on Postfix featuring virtual users and domains, i.e. users and domains that are in a MySQL database.
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