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Content Tagged with Debian + Security
How to add a Disclaimer To Outgoing Emails in Postfix
We have already dicussed how to install and configure postfix now we will learn about How to add a Disclaimer To Outgoing Emails in Postfix using altermime.
alterMIME is a small program which is used to alter your mime-encoded mailpacks as typically received by Inflex, Xamime and AMaViS.
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Protect Your Files With TrueCrypt 5.1a On Debian Etch (GNOME)
Protect Your Files With TrueCrypt 5.1a On Debian Etch (GNOME)
This document describes how to set up TrueCrypt 5.1a on Debian Etch (GNOME). Taken from the TrueCrypt page: "TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc)."
Read more...Protect Your Files With TrueCrypt 5.1a On Debian Etch (GNOME)
Protect Your Files With TrueCrypt 5.1a On Debian Etch (GNOME)
This document describes how to set up TrueCrypt 5.1a on Debian Etch (GNOME). Taken from the TrueCrypt page: "TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc)."
Read more...Howto Crack Rar, 7z, and zip files in Linux
If you forget your password for compressed archive (rar, 7z, zip), this program is the solution.This program uses bruteforce algorithm to find correct password. You can specify wich characters will be used in password generations.
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sshpass - Non-interactive ssh password authentication
SSH’s (secure shell) most common authentication mode is called “interactive keyboard password authentication”, so called both because it is typically done via keyboard, and because openssh takes active measures to make sure that the password is, indeed, typed interactively by the keyboard. Sometimes, however, it is necessary to fool ssh into accepting an interactive password non-interactively. This is where sshpass comes in.
SECURITY NOTE: There is a reason openssh insists that passwords be typed interactively. Passwords are harder to store securely and to pass around securely between programs. If you
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How to filter spam with Spamassassin and Postfix in Debian
We have already discussed how to install mail server with postfix+Devcot+SASL+Squirrel Mail in this article we will see how to add spam filter for postfix mail server.
Apache SpamAssassin is an extensible email filter that is used to identify spam. Once identified, the mail can then be optionally tagged as spam for later filtering. It provides a command line tool to perform filtering, a client-server system to filter large volumes of mail, and Mail::SpamAssassin, a set of Perl modules allowing Apache SpamAssassin to be used in a wide variety of email systems.
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New Firebird packages fix several vulnerabilities in debian
How To Set Up SSH With Public-Key Authentication On Debian Etch
How To Set Up SSH With Public-Key Authentication On Debian Etch
This mini-howto explains how to set up an SSH server on Debian Etch with public-key authorization (and optionally with disabled password logins). SSH is a great tool to control Linux-based computers remotely. It's safe and secure.
Read more...autossh - Automatically restart SSH sessions and tunnels
autossh is a program to start an instance of ssh and monitor it, restarting it as necessary should it die or stop passing traffic. The idea is from rstunnel (Reliable SSH Tunnel), but implemented in C. Connection monitoring is done using a loop of port forwardings. It backs off on the rate of connection attempts when experiencing rapid failures such as connection refused.
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Chrooting Apache2 With mod_chroot On Debian Etch
Chrooting Apache2 With mod_chroot On Debian Etch
This guide explains how to set up mod_chroot with Apache2 on a Debian Etch system. With mod_chroot, you can run Apache2 in a secure chroot environment and make your server less vulnerable to break-in attempts that try to exploit vulnerabilities in Apache2 or your installed web applications.
Read more...How To Check If Your Server Is Infected With The Linux/Rst-B Backdoor (Debian Etch)
How To Check If Your Server Is Infected With The Linux/Rst-B Backdoor (Debian Etch)
Linux Rst-B is a backdoor that can be used to add your server to botnets (see http://www.heise.de/newsticker/meldung/103563 (in German)). This short guide explains how you can install and use the Sophos Linux/RST-B detection tool to check your Debian Etch server and find out if it is infected with Linux Rst-B.
Read more...Setting Port Security on a Cisco Catalyst Switch
If you want to ensure that only a certain device—for example, a server—is plugged into a particular switch port, you can configure the MAC address of the server as a static entry associated with the switch port.
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Access Network When Everything Else is Blocked Using ptunnel
Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. At first glance, this might seem like a rather useless thing to do, but it can actually come in handy in some cases. The following example illustrates the main motivation in creating ptunnel:
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Intrusion Detection: Snort, Base, MySQL, and Apache2 On Ubuntu 7.10 (Gutsy Gibbon) (Updated)
Intrusion Detection: Snort, Base, MySQL, and Apache2 On Ubuntu 7.10 (Gutsy Gibbon) (Updated)
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.
Read more...Lynis - Security and system auditing tool
Lynis is an auditing tool which tests and gathers information from Unix based systems. The audience for this tool are security and system auditors, network specialists and system maintainers.
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Setting Up ProFTPd + TLS On Debian Etch
Setting Up ProFTPd + TLS On Debian Etch
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 Etch server.
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