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Free and Open Source Network UTM Firewalls

Free and Open Source Network UTM  Firewalls

Free and Open Source Network UTM  Linux Firewalls

Free and Open Source Network UTM  Linux Firewalls

 

pfSense

pfSense

pfSense

pfSense is an open source security solution with a custom kernel based on the FreeBSD OS. It is a software distribution that is customised especially to be used as a firewall and router. This open source firewall can be installed on bare metal hardware and be managed entirely through a Web interface. Apart from firewalling and routing platforms, you can expand its functionality by using its many features, without adding bloat and potential security vulnerabilities to the base distribution.

Features

  • Firewall – IP/port filtering, limiting connections, Layer 2 capable, scrubbing
  • State table – By default, all rules are stateful, and there are multiple configurations available for state handling
  • Server load balancing (LB) – Inbuilt LB to distribute load between multiple backend servers
  • NAT (network address translation) – Port forwarding, reflection
  • HA (high-availability) – Failover to secondary if primary fails
  • Multi-WAN (wide area network) – Uses more than one Internet connection
  • VPN (virtual private network) – Supports IPsec and OpenVPN
  • Reporting – Keeps historical resource utilisation information
  • Monitoring – Real-time monitoring
  • Dynamic DNS – Multiple DNS clients are included
  • DHCP and relay ready

Some examples:

  • Security – Stunner, Snort, Tinc, Nmap, arpwatch
  • Monitoring – iftop, ntopng, Softflowd, urlsnarf, darkstat, mailreport
  • Networking – NetIO, nut, Avahi
  • Routing – FRR, OLSRd, routed, OpenBGPD
  • Services – Iperf, widentd, syslog-ng, bind, Acme, Imspector, Git, DNS-server

ClearOS

ClearOS

ClearOS

ClearOS is a CentOS based open source firewall that transforms your standard PC into a committed firewall and Internet server/gateway. ClearOS has three editions: ClearOS Business, ClearOS Home and ClearOS Community. The community edition is free for a lifetime but for the other two, you need to purchase a subscription. It is one of the best open source firewalls for small to mid-sized businesses (SMBs). It is a complete network solution and you can extend the functionality by installing the apps such as the bandwidth manager, DHCP server, DMZ, DNS server and more.

Features

  • Firewall, networking and security
  • Provides several levels of security
  • Bandwidth QoS manager
  • DMZ, 1-to-1 NAT and port forwarding
  • At the protocol level, the peer-to-peer detection system lets you manage file sharing usage
  • Intrusion detection and intrusion prevention systems
  • Virtual private networking
  • Web proxy and content filtering

IPFire

IPFire

IPFire

IPFire is built on top of Netfilter and is an open source distribution. IPFire was designed with both modularity and a high level of flexibility in mind. It can be used as a firewall, proxy server or VPN gateway. The IDS (intrusion detection system) is inbuilt, so attacks are detected and prevented from Day One. And with the help of Guardian (an optional add-on), you can implement automatic prevention.

Features

  • Stateful packet inspection (SPI)
  • Proxy server with content filter and caching functionality
  • Intrusion detection system
  • VPN via IPsec and OpenVPN
  • DHCP server
  • Caching name server
  • Time server
  • Wake-on-LAN (WOL)
  • Dynamic DNS

OPNsense

OPNsense

OPNsense

OPNsense is an open source, easy-to-use and easy-to-build FreeBSD based firewall and routing platform. It includes most of the features available in expensive commercial firewalls, and more. OPNsense offers the rich feature set of commercial offerings with the benefits of open and verifiable sources.

Features

  • Traffic shaper
  • Captive portal
  • Forward caching proxy
  • Virtual private network
  • High availability and hardware failover
  • Intrusion detection and inline prevention
  • Built-in reporting and monitoring tools
  • Support for plugins
  • DNS server and DNS forwarder
  • DHCP server and relay

VyOS

VyOS

VyOS

VyOS is an open source network operating system based on Linux and includes multiple applications such as Quagga, ISC DHCPD, OpenVPN, StrongS/WAN and others, under a single management interface. It can be installed on any physical hardware, on a virtual machine or a cloud platform.

Features

  • VLANs
  • Static and dynamic routing
  • Firewall rulesets for IPv4 and IPv6 traffic
  • Tunnel interfaces
  • PPPoE, GRE, IPIP, SIT, static L2TPv3, VXLAN
  • VPN
  • NAT
  • DHCP and DHCPv6 server and relay
  • NetFlow and sFlow
  • Web proxy and URL filtering
  • QoS policies (drop tail, fair queue, and others), traffic redirection
  • VRRP, connection table synchronisation

 

Smoothwall

Smoothwall

Smoothwall

Smoothwall is a Linux distribution designed to be used as an open source firewall. It is configured via a Web based GUI and requires little or no knowledge of Linux to install and use it. Smoothwall Express supports LAN, DMZ, internal/external network firewalling, Web proxy for acceleration, traffic stats, etc. Shutting down or rebooting is possible directly through the Web interface.

Features

  • Supports LAN, DMZ and wireless networks
  • External connectivity via Static Ethernet, DHCP Ethernet, PPPoE, PPPoA using various USB and PCI DSL modems
  • Port forwards, DMZ pin-holes
  • Outbound filtering
  • Timed access
  • Simple to use Quality-of-Service (QoS)
  • Traffic stats, including per interface and per IP totals for weeks and months
  • IDS via automatically updated Snort rules
  • UPnP support
  • List of bad IP addresses to block

Untangle

Untangle

Untangle

Untangle NG Firewall takes the complexity out of network security—saving users’ time. This firewall is intended to balance performance and protection, policy and productivity. It’s an ideal fit for a range of organisations seeking a powerful, cost-effective network security solution that can handle any IT challenge — from small, remote offices to diverse school campuses and large, distributed organisations. The NG Firewall has different software modules that can be enabled or disabled as per individual requirements. These software modules are also called apps. They are both free and paid apps. So, for full functionality, you have to buy subscriptions for what you want.

Features

  • Virus blocker
  • Firewall
  • Web monitor
  • Spam Blocker Lite
  • Ad blocker
  • OpenVPN
  • Captive portal
  • Intrusion prevention
  • Phish blocker

 

Endian Firewall

Endian Firewall

Endian Firewall

Endian Firewall is a full-featured unified threat management solution, which uses the stateful packet inspection concept based firewall. It can be deployed as a proxy, gateway, and router with Open VPN.

Some of the features provided by the Endian Firewall are displayed in Figure 6.

  • Endian is a bi-directional firewall
  • It protects the network from Internet threats
  • By analysing the traffic flow, it prevents intrusion into the network
  • It has VPN with IPsec, which provides a secure and simple VPN tunnel through which many users can connect from a remote location
 Moonwall provide a firewall based on FreeBSD and a combination of other software utilities.

pfSense is a free open source firewall and router.

Shorewall firewall is a tool designed to configure Netfilter.

Smoothwall Express is an open source firewall based on a hardened GNU/Linux OS.

StillSecure deliver a software based firewall solution known as Cobia. Cobia can be installed on VMware as well. Cobia includes the ability to perform Routing, DHCP, DNS, Wireless, Firewall, VPN, Content Filtering, Reporting and more. Cobia can use modules provided by StillSecure or other third party organisations and developers. Cobia software comes as a public community license and a commercial use license. Via the StillSecure Community License, users can freely download and modify the source code.

Vyatta Core is an open source firewall offering IPv4 and IPv6 routing, intrusion prevention , stateful firewalling, IPSec and SSL OpenVPN and more.

Zeroshell is a Linux based firewall. The firewall has some good functionality such as the ability to load balance internet connections, integrate with LDAP, captive portal for web login authentication and more.

Zorp is an application layer firewall based on the Python scripting language.

Firewall Management Software Solutions Vendor List

AlgoSec deliver Firewall Analyzer which provides firewall policy auditing, policy cleanup, risk analysis, change monitoring and more. Algosec supports all the major firewall vendors. Algosec also offer AlgoSec FireFlow which is a change management solution.

Athena Security have a solution known as FirePAC that can clean up firewall policies, provide auditing and optimisation. Athena Security also offer a free tool called Firewall Browser which can help you find rules based on certain network criteria and supports Cisco, Checkpoint and Netscreen firewalls.

Secure Passage is a specialist in managing firewalls and offer a solution called Firemon. Firemon will give you visibility to unused rules and which rules are used and the frequency they are used. Firemon supports a large range of firewalls such as Cisco Checkpoint and others. Firemon also supports routers and load balancers. The solution will help you keep in control of your firewall policies, provide PCI DSS assistance, policy cleanup and provides other advantages as well.

 Skybox Security is a firewall management device that helps controlling firewall risks and provides visibility of network topology and firewall device configuration.
Tufin SecureTrak delivers firewall management, auditing and change control and automation.

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What is a firewall?

What is a Firewall? and How Does It Work?

Introduction

A firewall is a system that provides network security by filtering incoming and outgoing network traffic based on a set of user-defined rules. In general, the purpose of a firewall is to reduce or eliminate the occurrence of unwanted network communications while allowing all legitimate communication to flow freely. In most server infrastructures, firewalls provide an essential layer of security that, combined with other measures, prevent attackers from accessing your servers in malicious ways.

This guide will discuss how firewalls work, with a focus on stateful software firewalls, such as iptables and FirewallD, as they relate to cloud servers. We’ll start with a brief explanation of TCP packets and the different types of firewalls. Then we’ll discuss a variety of topics that a relevant to stateful firewalls. Lastly, we will provide links to other tutorials that will help you set up a firewall on your own server.

TCP Network Packets

Before discussing the different types of firewalls, let’s take a quick look at what Transport Control Protocol (TCP) network traffic looks like.

TCP network traffic moves around a network in packets, which are containers that consist of a packet header—this contains control information such as source and destination addresses, and packet sequence information—and the data (also known as a payload). While the control information in each packet helps to ensure that its associated data gets delivered properly, the elements it contains also provides firewalls a variety of ways to match packets against firewall rules.

It is important to note that successfully receiving incoming TCP packets requires the receiver to send outgoing acknowledgment packets back to the sender. The combination of the control information in the incoming and outgoing packets can be used to determine the connection state (e.g. new, established, related) of between the sender and receiver.

Types of Firewalls

Let’s quickly discuss the three basic types of network firewalls: packet filtering (stateless), stateful, and application layer.

Packet filtering, or stateless, firewalls work by inspecting individual packets in isolation. As such, they are unaware of connection state and can only allow or deny packets based on individual packet headers.

Stateful firewalls are able to determine the connection state of packets, which makes them much more flexible than stateless firewalls. They work by collecting related packets until the connection state can be determined before any firewall rules are applied to the traffic.

Application firewalls go one step further by analyzing the data being transmitted, which allows network traffic to be matched against firewall rules that are specific to individual services or applications. These are also known as proxy-based firewalls.

In addition to firewall software, which is available on all modern operating systems, firewall functionality can also be provided by hardware devices, such as routers or firewall appliances. Again, our discussion will be focused on stateful software firewalls that run on the servers that they are intended to protect.

Firewall Rules

As mentioned above, network traffic that traverses a firewall is matched against rules to determine if it should be allowed through or not. An easy way to explain what firewall rules looks like is to show a few examples, so we’ll do that now.

Suppose you have a server with this list of firewall rules that apply to incoming traffic:

  1. Accept new and established incoming traffic to the public network interface on port 80 and 443 (HTTP and HTTPS web traffic)
  2. Drop incoming traffic from IP addresses of the non-technical employees in your office to port 22 (SSH)
  3. Accept new and established incoming traffic from your office IP range to the private network interface on port 22 (SSH)

Note that the first word in each of these examples is either “accept”, “reject”, or “drop”. This specifies the action that the firewall should do in the event that a piece of network traffic matches a rule. Accept means to allow the traffic through, reject means to block the traffic but reply with an “unreachable” error, and drop means to block the traffic and send no reply. The rest of each rule consists of the condition that each packet is matched against.

As it turns out, network traffic is matched against a list of firewall rules in a sequence, or chain, from first to last. More specifically, once a rule is matched, the associated action is applied to the network traffic in question. In our example, if an accounting employee attempted to establish an SSH connection to the server they would be rejected based on rule 2, before rule 3 is even checked. A system administrator, however, would be accepted because they would match only rule 3.

Default Policy

It is typical for a chain of firewall rules to not explicitly cover every possible condition. For this reason, firewall chains must always have a default policy specified, which consists only of an action (accept, reject, or drop).

Suppose the default policy for the example chain above was set to drop. If any computer outside of your office attempted to establish an SSH connection to the server, the traffic would be dropped because it does not match the conditions of any rules.

If the default policy were set to accept, anyone, except your own non-technical employees, would be able to establish a connection to any open service on your server. This would be an example of a very poorly configured firewall because it only keeps a subset of your employees out.

Incoming and Outgoing Traffic

As network traffic, from the perspective of a server, can be either incoming or outgoing, a firewall maintains a distinct set of rules for either case. Traffic that originates elsewhere, incoming traffic, is treated differently than outgoing traffic that the server sends. It is typical for a server to allow most outgoing traffic because the server is usually, to itself, trustworthy. Still, the outgoing rule set can be used to prevent unwanted communication in the case that a server is compromised by an attacker or a malicious executable.

In order to maximize the security benefits of a firewall, you should identify all of the ways you want other systems to interact with your server, create rules that explicitly allow them, then drop all other traffic. Keep in mind that the appropriate outgoing rules must be in place so that a server will allow itself to send outgoing acknowledgements to any appropriate incoming connections. Also, as a server typically needs to initiate its own outgoing traffic for various reasons—for example, downloading updates or connecting to a database—it is important to include those cases in your outgoing rule set as well.

Writing Outgoing Rules

Suppose our example firewall is set to drop outgoing traffic by default. This means our incoming accept rules would be useless without complementary outgoing rules.

To complement the example incoming firewall rules (1 and 3), from the Firewall Rules section, and allow proper communication on those addresses and ports to occur, we could use these outgoing firewall rules:

  1. Accept established outgoing traffic to the public network interface on port 80 and 443 (HTTP and HTTPS)
  2. Accept established outgoing traffic to the private network interface on port 22 (SSH)

Note that we don’t need to explicitly write a rule for incoming traffic that is dropped (incoming rule 2) because the server doesn’t need to establish or acknowledge that connection.

Firewall Software and Tools

Now that we’ve gone over how firewalls work, let’s take a look at common software packages that can help us set up an effective firewall. While there are many other firewall-related packages, these are effective and are the ones you will encounter the most.

Iptables

Iptables is a standard firewall included in most Linux distributions by default (a modern variant called nftables will begin to replace it). It is actually a front end to the kernel-level netfilter hooks that can manipulate the Linux network stack. It works by matching each packet that crosses the networking interface against a set of rules to decide what to do.

To learn how to implement a firewall with iptables, check out these links:

  • How To Set Up a Firewall Using IPTables on Ubuntu 14.04
  • How To Implement a Basic Firewall Template with Iptables on Ubuntu 14.04
  • How To Set Up an Iptables Firewall to Protect Traffic Between your Servers

UFW

UFW, which stands for Uncomplicated Firewall, is an interface to iptables that is geared towards simplifying the process of configuring a firewall.

To learn more about using UFW, check out this tutorial: How To Setup a Firewall with UFW on an Ubuntu and Debian Cloud Server.

FirewallD

FirewallD is a complete firewall solution available by default on CentOS 7 servers. Incidentally, FirewallD uses iptables to configure netfilter.

To learn more about using FirewallD, check out this tutorial: How To Configure FirewallD to Protect Your CentOS 7 Server.

If you’re running CentOS 7 but prefer to use iptables, follow this tutorial: How To Migrate from FirewallD to Iptables on CentOS 7.

Fail2ban

Fail2ban is an intrusion prevention software that can automatically configure your firewall to block brute force login attempts and DDOS attacks.

To learn more about Fail2ban, check out these links:

  • How Fail2ban Works to Protect Services on a Linux Server
  • How To Protect SSH with Fail2Ban on Ubuntu 14.04
  • How To Protect an Nginx Server with Fail2Ban on Ubuntu 14.04
  • How To Protect an Apache Server with Fail2Ban on Ubuntu 14.04

Conclusion

Now that you understand how firewalls work, you should look into implementing a firewall that will improve your security of your server setup by using the tutorials above.

A firewall is a software program or piece of hardware that helps screen out hackers, viruses, and worms that try to reach your computer over the Internet. If you can’t start Windows Firewall or you are getting an error, use Microsoft free tool to diagnose and fix problems.

  • If you use a computer at home, the most effective and important first step you can take to help protect your computer is to turn on a firewall.
  • Windows 8, Windows 7, Windows Vista, and Windows XP SP2 or higher have a firewall built-in and turned on by default. (Note: Support for Windows XP ended in April 2014.)
  • If you have more than one computer connected in the home, or if you have a small-office network, it is important to protect every computer. You should have a hardware firewall (such as a router) to protect your network, but you should also use a software firewall on each computer to help prevent the spread of a virus in your network if one of the computers becomes infected.
  • If your computer is part of a business, school, or other organizational network, you should follow the policy established by the network administrator.

Automatically diagnose and fix problems with Windows Firewall

Follow these steps to automatically repair Windows Firewall problems:
 
    • Select the Download button on this page.
    • In the File Download dialog box, click Run or Open, and then follow the steps in the Windows Firewall Troubleshooter.
Notes
  • This troubleshooter might be in English only. However, the automatic fix also works for versions of Windows in other languages.
  • If you’re not on the computer that has the problem, save the troubleshooter to a flash drive or a CD, and then run it on the computer that has the problem.
Download
What it fixes
    • Windows Firewall isn’t the default firewall
    • Windows Firewall doesn’t start
    • Windows couldn’t start Windows Firewall (Service-specific error 5 (0x5))
    • Remote Assistance isn’t working because it’s blocked by Windows Firewall
    • You’re unable to access shared files and printers because sharing is blocked by Windows Firewall
    • BFE service is missing
    • Firewall won’t start (Error Code 80070424)
Runs on
    • Windows 7
    • Windows 8
    • Windows 8.1
    • Windows 10

What is a firewall?

A firewall is a network security device located between your internal network and the wider Internet. A firewall monitors incoming and outgoing network traffic – blocking or allowing it based on a set of configurable rules.

Firewalls are a fundamental piece of security and typically form the first line of defence on a network. Acting as a filter against bad connections from the outside world.

A firewall works by comparing the data sent into or out of the network against a list of rules. Based on the results of the rule checking, the firewall will then either block or allow the connection.

How does a firewall work?

Firewalls work by inspecting data packets (small chunks of data) against an internal list of rules. Here are some of the more common ones:

  • IP addresses – filter out traffic from suspicious IPs
  • Domain names – block traffic from known malicious domains
  • Ports – deny traffic trying to enter through a certain port
  • Contents – block data packets containing certain keywords

A firewall scans the contents of the packet and then determines whether to let it through based on the rules in place. On a typical network setup, all connections to the Internet flow through the firewall. Meaning it inspects all inbound or outgoing packets.

How does firewall inspection work?

The process of inspection involves comparing a packet’s contents against the firewall’s set of rules. Depending on if the rule is setup as a blacklist or whitelist, it will react differently to a match.

  • A blacklist rule will block any packets which match the criteria.
  • A whitelist rule will block any packets which don’t match the criteria.

A firewall’s rules are highly configurable. Meaning you can make the packet inspection process unique to your security setup. Here are some examples of how you could use custom firewall rules:

  • Creating a whitelist for your own company IP. Preventing any outsiders from accessing what’s behind the firewall.
  • Making a blacklist for the IP of a known malicious file server. Stopping it from distributing malware onto your network.
  • Creating a whitelist for certain domain extensions (.com, .co.uk .edu e.t.c.) on outgoing traffic. Blocking staff from accessing potentially dangerous sites.

Why are firewalls important?

Firewalls are often compared to a lock on the door to your network. But it might be more accurate to say that a firewall is the door.

Without a firewall in place, any connection can flow freely in or out of your network. Including connections from known malicious sources. This means you could experience unauthorised access to networked files. Leading to a data breach, malware infection or worse.

You need a firewall to filter out the bulk of malicious connections. And there’s a lot of malicious connections. One study found that within 52 seconds of being online, servers were being probed by hackers. With an average rate of 757 connection attempts per hour.

Are firewalls hardware or software?

Firewalls can be either a hardware appliance or a piece of software which runs on a machine. So, the answer is both.

Not helpful, I know.

But the main difference between the two is this:

  • Software firewalls tend to protect the individual machine it’s installed upon, typically a laptop or PC
  • Hardware firewalls usually protect many machines or an entire network.

What types of firewall are there?

Circuit-level

Circuit level firewalls are a type of firewall that monitors transmission control protocol (TCP) handshaking. It ensures that the communication between packets is legitimate and not malicious.

Stateful inspection

A firewall with stateful inspection considers the state of current connections when filtering packets. This means that the firewall can block the packet in one case but allowed in another. Depending on the current state of the connection.

Unified threat management (UTM)

Whilst technically not a type of firewall, UTM is instead an advanced security appliance which combines the security functions of many different security appliances. One of these being a firewall. We have an article explaining everything you need to know about UTM if you wish to learn more.

What is a next-generation firewall?

A next-generation firewall (NGFW) contains all the normal defences that a traditional firewall has and more. The most common additions are intrusion prevention software and application control. But certain vendors have other bonus security features. NGFWs are also capable of deep packet inspection which enables more robust filters.

Intrusion prevention software monitors network activity to detect and stop vulnerability exploits from occurring. This is usually done by monitoring for breaches against the network policies in place.

Application control software sets up a hard filter for programs that can send or receive data over the Internet. This can either be done by blacklist (blocks any programs in the filter) or by whitelist (blocks any programs not in the filter).

What is deep packet inspection?

Deep Packet Inspection (DPI) is a type of packet inspection which analyses the full contents of a data packet. Instead of only information in a packet’s header (where it is coming from and going to).

This enables DPI to filter out malicious packets, such as viruses and trojans, with better accuracy. As rather than only looking at the sender and destination, the packet’s contents can be used in filters as well.

This allows DPI to uncover a broader range of security threats because it will discover packets with a malicious payload but an innocuous header.

Where did the name firewall come from?

A final piece of trivia: the name firewall originated from the real-world application of fire partitions used in buildings. These would be walls that were implemented into a building to act as a barrier to stop fire spreading from one room to another.

The similarity between a fire spreading through a building and a computer virus spreading through a network prompted the same name to be adopted for the network device.

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