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disabled = yes, which is on by default. Because it s on by default, the service won t run until you remove the option or change it to disabled = no. Listing 9-17 shows the configuration file for the time service. Listing 9-17. Default Configuration File for the time Service root@RNA:~# cat /etc/xinetd.d/time # default: off # description: An RFC 868 time server. This protocol provides a # site-independent, machine-readable date and time. The Time service sends back # to the originating source the time in seconds since midnight on January first # 1900. # This is the tcp version. service time { disable = yes type = INTERNAL id = time-stream socket_type = stream protocol = tcp user = root wait = no } # This is the udp version. service time { disable = yes type = INTERNAL id = time-dgram socket_type = dgram protocol = udp user = root wait = yes } Of the options used in this configuration file, only two are really important because the rest of them are set automatically. The first option that you have to tune is the disable option. This option has the value yes by default, which means that the service is not active. To activate the service, set it to disable = no. The second option is user, which specifies what user permissions the option should be started with. Many services are started as root by default. If you can, change it to some other user with not so many permissions.

A process is something that exists entirely behind the scenes. When the user runs a program, one or many processes might be started, but they re usually invisible unless the user specifically chooses to manipulate them. You might say that programs exist in the world of the user, but processes belong in the world of the system. Processes can be started not only by the user, but also by the system itself to undertake tasks such as system maintenance, or even to provide basic functionality, such as the GUI system. Many processes are started when the computer boots up, and then they sit in the background, waiting until they re needed (such as programs that send mail). Other processes are designed to work periodically to accomplish certain tasks, such as ensuring system files are up-to-date. You can see what processes are currently running on your computer by running the top program. Running top is simply a matter of typing the command at the shell prompt. As you can see in Figure 16-1, top provides very comprehensive information and can be a bit overwhelming at first sight. However, the main area of interest is the list of processes (which top refers to as tasks).

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rfind(sub[,start[,end]])

Here s an example of a line taken from top on our test PC, shown with the column headings from the process list:

If a service runs from xinetd, it can be secured with TCP Wrapper. To ensure that you can use it, install TCP wrapper using apt-get install tcpd as root. Stated in a more general way, if a service is using the libwrap.so library module, you can secure it with TCP Wrapper. Because

A lot of information is presented here, as described in Table 16-1.

rindex(sub[,start[,end]])

The first number is the process ID (PID). This is the unique number that the system uses to track the process. The PID comes in handy if you want to kill (terminate) the process (as explained in the next section of this chapter). This column lists the owner of the particular process. As with files, all processes must have an owner. A lot of processes will appear to be owned by the root user. Some of them are system processes that need to access the system hardware, which is something only the root user is allowed to do. Other processes are owned by root for protection; root ownership means that ordinary users cannot tamper with these processes.

xinetd uses this module, you can secure it this way. Other services that aren t started with xinetd but do use this library can be secured with TCP Wrapper as well. To check whether a service is capable of working with TCP Wrapper, use the ldd command followed by the complete name of the service you want to check. If libwrap.so is listed, TCP Wrapper works for the service. If it isn t, use a generic firewall such as iptables. See Listing 9-18 for an example. Listing 9-18. Checking Whether a Service Can Be Secured with TCP Wrapper root@RNA:~# ldd /usr/sbin/xinetd linux-gate.so.1 => (0xffffe000) libwrap.so.0 => /lib/libwrap.so.0 (0xb7fd0000) libnsl.so.1 => /lib/tls/i686/cmov/libnsl.so.1 (0xb7fb9000) libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7f91000) libcrypt.so.1 => /lib/tls/i686/cmov/libcrypt.so.1 (0xb7f63000) libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7e22000) /lib/ld-linux.so.2 (0xb7fe3000) TCP Wrapper was developed before xinetd existed and when only its predecessor inetd was available. This service didn t include any way of regulating access to services, so inetd could be used to start tcpd, TCP Wrapper, which in turn could be configured to start the necessary service. The task of tcpd was to check whether a host trying to connect to the service was allowed access or not. The nice thing about tcpd is that it sits between (x)inetd and the service a client is connecting to. Therefore, from the outside it s not possible to see whether tcpd is blocking access to a service or whether the service simply isn t there.

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