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CHAPTER 10 NETWORK SECURITY
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Warning: If you are connected to your server via the SSH protocol, you must make sure that you do not
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uncheck SSH or you will become disconnected from your server and will not be able to reconnect without physical access to the server.
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Although system config securitylevel provides basic firewall control, you may find that you want to configure your firewall with a finer level of control. To achieve this you will need to configure netfilter using the iptables command. There are three ways to do this under CentOS. The first method involves entering commands directly at the shell prompt. The rules you enter in this way will take effect immediately and remain in effect until you remove them or reboot the server. This is a good way to check that the syntax of your rule is correct and to test it to make sure that it blocks or allows the correct traffic. The next method builds on the first method of inputting rules but extends the idea with a method to save the running rules so they will persist over a reboot. This is done by using the iptables service. You can also configure the service to save the current rules automatically at shutdown. The third method involves editing the iptables configuration file directly. By maintaining this file you save your rules before they are activated; and when they are activated, all rules are activated at the same time. You can also write comments to explain what your rule is doing, and you can easily copy the configuration from one server to another. Before you can use any of these methods you need to understand how to build a netfilter rule and how to input it using iptables. Rules are built up with a number of ways for matching a network packet and with a target or action to take when a matching packet is found. Because we are extending the configuration generated by system config securitylevel, some of the decisions on how to structure these rules have been made for us. In order to write effective netfilter rules you will need to know a bit about how netfilter works. It would be possible to fill an entire book on netfilter, so we will just look at a few concepts that are relevant to our firewall. If you want more details on what you can do with netfilter, check the netfilter web site at http://www.netfilter.org/. Readers who want to get their hands dirty with some of the advanced features of netfilter may wish to read Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT and l7-filter, by Lucian Gheorghe (Packt Publishing, 2006).
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Netfilter works by hooking into the kernel network processing in a few key places known as inspection points. In this section we are focusing on the filtering capabilities of netfilter, so we are concerned with packets as they go into and come out of an application and as they are forwarded by the kernel routing module. Although all the processing is done by the kernel, the names for where the processing takes place, INPUT and OUTPUT, have been chosen with the point of view of an application in mind. The name for forwarding packets is FORWARD. There are other places that netfilter can hook into. These are called PREROUTING and POSTROUTING and are commonly used for altering the packet addressing. We will touch on these in the section on masquerading. Each of these inspection points can be used with one or more tables called filter, nat, and mangle. Again we are looking at the filter table, which happens to be the default table used by the iptables program. This table can be used with the INPUT, OUTPUT, and FORWARD inspection points. The nat table is used for network address translation, which involves altering the packet addressing. It uses the PREROUTING, POSTROUTING, and OUTPUT inspection points. The mangle table allows for arbitrary packet
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