Difference between revisions of "Firewalls"

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{{Note|Checks at Shields Up are only a valid measure of your router should you have one in the LAN.  To accurately evaluate a software firewall, one needs to directly connect the box to the cable modem.}}
 
{{Note|Checks at Shields Up are only a valid measure of your router should you have one in the LAN.  To accurately evaluate a software firewall, one needs to directly connect the box to the cable modem.}}
 
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==Firewall Guides & Tutorials==
 
==Firewall Guides & Tutorials==

Revision as of 11:36, 3 January 2013


Tango-edit-clear.pngThis article or section needs language, wiki syntax or style improvements.Tango-edit-clear.png

Reason: convert to Template:App (Discuss in Talk:Firewalls#)

A firewall is a system designed to prevent unauthorized access to or from a private network (which could be just one machine). Firewalls can be implemented in only hardware or software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and allows, proxys, or denies the traffic based on specified security criteria.

The firewalls listed in this article are overwhelmingly based on the iptables program. Consider configuring the iptables process yourself according to its wiki page (listed below) to keep to the The Arch Way.

There are many posts on the forums about different firewall apps and scripts so here they all are condensed into one page - please add your comments about each firewall, especially ease of use and a security check at Shields Up.

Note: Checks at Shields Up are only a valid measure of your router should you have one in the LAN. To accurately evaluate a software firewall, one needs to directly connect the box to the cable modem.

Firewall Guides & Tutorials

  • Uncomplicated Firewall, the wiki page for the simple iptables frontend, ufw, provides a nice tutorial for a basic configuration.
  • Router Setup Guide. A tutorial for turning a computer into an internet gateway/router. It focuses on security and configuring your gateway to have as few insecure holes to the internet as possible.

External Firewall Tutorials

  • http://tldp.org/HOWTO/Masquerading-Simple-HOWTO/IP Masq is a form of Network Address Translation or NAT that allows internally networked computers that do not have one or more registered Internet IP addresses to have the ability to communicate to the Internet via your Linux boxes single Internet IP address.

iptables front-ends

iptables

  • Iptables — A powerful firewall built into the Linux kernel that is part of the Netfilter project. Most firewalls, as described in this section below, are usually just front-ends.
http://www.netfilter.org/projects/iptables/index.html || iptables

Also see the man pages: (man iptables) – http://unixhelp.ed.ac.uk/CGI/man-cgi?iptables+8

Arno's Firewall

Arno's IPTABLES Firewall Script is a secure firewall for both single and multi-homed machines.

The script:

  • EASY to configure and highly customizable
  • daemon script included
  • a filter script that makes your firewall log more readable

Supports:

  • NAT and SNAT
  • port forwarding
  • ADSL ethernet modems with both static and dynamically assigned IPs
  • MAC address filtering
  • stealth port scan detection
  • DMZ and DMZ-2-LAN forwarding
  • protection against SYN/ICMP flooding
  • extensive user definable logging with rate limiting to prevent log flooding
  • all IP protocols and VPNs such as IPsec
  • plugin support to add extra features.

ferm

ferm (which stands for "For Easy Rule Making") is a tool to maintain complex firewalls, without having the trouble to rewrite the complex rules over and over again. ferm allows the entire firewall rule set to be stored in a separate file, and to be loaded with one command. The firewall configuration resembles structured programming-like language, which can contain levels and lists.

Firehol

FireHOL is a language to express firewalling rules, not just a script that produces some kind of a firewall. It makes building even sophisticated firewalls easy - the way you want it. The result is actually iptables rules.

firehol is available in the official repositories.

Firetable

Firetable is an iptables-based firewall with "human readable" syntax.

firetableAUR is available in the AUR.

Shorewall

The Shoreline Firewall, more commonly known as "Shorewall", is high-level tool for configuring Netfilter. You describe your firewall/gateway requirements using entries in a set of configuration files. Shorewall reads those configuration files and with the help of the iptables utility, Shorewall configures Netfilter to match your requirements. Shorewall can be used on a dedicated firewall system, a multi-function gateway/router/server or on a standalone GNU/Linux system. Shorewall does not use Netfilter's ipchains compatibility mode and can thus take advantage of Netfilter's connection state tracking capabilities.

shorewall is available in the official repositories.

ufw

ufw (uncomplicated firewall) is a simple front-end for iptables and is available in the official repositories.

See Uncomplicated Firewall for more information.

Vuurmuur

Vuurmuur Vuurmuur is a powerful firewall manager built on top of iptables. It has a simple and easy to learn configuration that allows both simple and complex configurations. The configuration can be fully configured through an ncurses GUI, which allows secure remote administration through SSH or on the console. Vuurmuur supports traffic shaping, has powerful monitoring features, which allow the administrator to look at the logs, connections and bandwidth usage in realtime.

VuurmuurAUR is available in the AUR.

iptables GUIs

Firestarter

Firestarter is a good GUI for iptables writen on GTK2, it has the ability to use both white and black lists for regulating traffic, it is very simple and easy to use, with good documentation available on their website.

FirestarterAUR has GNOME dependencies and is available in the AUR.

Guarddog

Guarddog is a really easy to use GUI for configuring iptables. After setting up a basic desktop configuration it passes all Shields Up tests perfectly.

GuarddogAUR requires kdelibs3 and is available in the AUR repository.

To have the firewall settings applied at boot-up you must run /etc/rc.firewall from inside /etc/rc.local or something similar.

Uncomplicated Firewall (ufw) Frontends

Gufw, a GTK-based front-end to ufw which happens to be a CLI front-end to iptables (gufw->ufw->iptables), is super easy and super simple to use.

Note: Gufw is perhaps the simplest replacement for tcp_wrappers, which was discontinued recently

kcm-ufw is a KDE alternative to Gufw.

See Uncomplicated Firewall for more info.

KMyFirewall

KMyFirewall is KDE3 GUI for iptables.

Firewall editing capabilities are simple enough to use to be suitable for beginners, but also allow for sophisticated tweaking of the firewall settings.

KMyFirewallAUR requires kdelibs3 and is available in the AUR.

Firewall Builder

Firewall Builder is "a GUI firewall configuration and management tool that supports iptables (netfilter), ipfilter, pf, ipfw, Cisco PIX (FWSM, ASA) and Cisco routers extended access lists. [...] The program runs on Linux, FreeBSD, OpenBSD, Windows and Mac OS X and can manage both local and remote firewalls." Source: http://www.fwbuilder.org/

fwbuilder is available in the official repositories.

Other

  • EtherApe — A graphical network monitor for various OSI layers and protocols.
http://etherape.sourceforge.net/ || etherape
  • Fail2ban — Bans IPs after too many failed authentification attempts against common daemons.
http://www.fail2ban.org/ || fail2ban

See Also

Debian Wiki's list of Firewalls: http://wiki.debian.org/Firewalls