Security

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The Perfect SpamSnake - Ubuntu Jeos 10.10 Maverick Meerkat

The Perfect SpamSnake - Ubuntu Jeos 10.10

This tutorial shows how to set up an Ubuntu Jeos based server as a spamfilter in Gateway mode. In the end, you will have a SpamSnake Gateway which will relay clean emails to your MTA. You will also be able to view your incoming queue, train your SpamSnake and carry out a few more advanced operations via Baruwa.

iRedMail 0.7.0: Open Source Mail Server With Postfix, Dovecot, Amavisd, ClamAV, SpamAssassin, RoundCube (OpenSuSE 11.4)

iRedMail 0.7.0: Open Source Mail Server With Postfix, Dovecot, Amavisd, ClamAV, SpamAssassin, RoundCube, iRedAdmin On OpenSuSE 11.3

iRedMail is a shell script that lets you quickly deploy a full-featured mail solution in less than 2 minutes. Its object is to make a Linux mail server installation and configuration simple, painless and easy to use. Since version 0.7.0, iRedMail supports OpenSuSE (it supports both i386 and x86_64). iRedMail supports both OpenLDAP and MySQL as backends for storing virtual domains and users. This tutorial shows how to use the OpenLDAP backend on OpenSuSE 11.3.

Using Firewall Builder To Configure Router Access Lists

Using Firewall Builder To Configure Router Access Lists

Firewall Builder is a firewall configuration and management GUI that supports configuring a wide range of firewalls from a single application. Supported firewalls include Linux iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many more. This tutorial is the first in a series of howtos that will walk through the basic steps of using Firewall Builder to configure each of the supported firewall platforms. In this tutorial we will configure Access Control Lists (ACL) on a Cisco router.

Installing The WiKID HTML5 Token Client

Installing The WiKID HTML5 Token Client

The WiKID HTML5 token uses the HTML5 APIs to enable the browser to contain an embedded token client. The token uses the same public key + PIN authentication as the standard WiKID tokens but is implemented in JavaScript within the browser. Using HTML5 provides cross-browser support (Firefox and Chrome, not IE yet), a very easy installation process and slick user experience. This tutorial will explain how to install the WiKID HTML5 token client.

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Fedora 14 x86_64)

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Fedora 14 x86_64)

This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. The resulting Postfix server is capable of SMTP-AUTH and TLS and quota (quota is not built into Postfix by default, I'll show how to patch your Postfix appropriately). Passwords are stored in encrypted form in the database (most documents I found were dealing with plain text passwords which is a security risk). In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

How To Test Your Dansguardian, Safesquid, POESIA, Parental Internet Filter Or We-Blocker Keyword Filter Anytime Anywhere

How To Test Your Dansguardian, Safesquid, POESIA, Parental Internet Filter Or We-Blocker Keyword Filter Anytime Anywhere

Keyword filters block unwanted web pages on the basis of potentially fallen words found in them. However, to be sure that a page is indeed offensive, keyword filters nowadays are not designed to block sites on the basis of just about any potentially offensive word. Instead they measure the number of potentially offensive phrases and often the number of times they occur so as to allow a limited number of occurrences in pages such as those on anatomy, forms requiring gender information, crime reports, statistical reports, administrative information, art etc. The leading keyword blockers like Dansguardian which is extremely popular on Linux or SafeSquid which is popular on Linux and Windows use this method known as a weighed keyword score.

How To Configure PureFTPd To Accept TLS Sessions On OpenSUSE 11.3

How To Configure PureFTPd To Accept TLS Sessions On OpenSUSE 11.3

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 configure PureFTPd to accept TLS sessions on an OpenSUSE 11.3 server.

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 10.10)

Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 10.10)

This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses. The resulting Postfix server is capable of SMTP-AUTH and TLS and quota. Passwords are stored in encrypted form in the database. In addition to that, this tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses. I will also show how to install SquirrelMail as a webmail interface so that users can read and send emails and change their passwords.

Preventing Brute Force Attacks With BlockHosts On Debian Lenny

Preventing Brute Force Attacks With BlockHosts On Debian Lenny

In this article I will show how to install and configure BlockHosts on a Debian Lenny 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.

Setting Up ProFTPd + TLS On Ubuntu 10.04 (Lucid Lynx)

Setting Up ProFTPd + TLS On Ubuntu 10.04 (Lucid Lynx)

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 10.04 server.

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