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value-add or enhancement offered by either inetd or xinetd is outweighed by the additional exposure created by using these daemons on your system. To remove initd or xinetd, you need to first check whether init or xinetd is running on your system and, if so, which of the daemons you are using. Listing 3-27 shows an easy way of doing this. Listing 3-27. Finding Out if Either inetd or xinetd Are Running puppy$ ps -A | grep 'xinetd\|inetd' 2106 00:00:00 xinetd The inetd/xinetd daemon is usually started by an init script when your system starts. The inetd daemon is controlled by the inetd.conf file and xinetd by the xinetd.conf file, both located in /etc. With the inetd daemon, all the services and the programs initiated by it are defined solely in the inetd.conf file, and the xinetd.conf file references a further directory, xinetd.d, which contains a collection of files, each of which contains configuration controlling a particular service or application.

s Make sure you have added a means of starting any applications that inetd or xinetd currently hanTip

Silverlight is a new web presentation technology that is created to run on a variety of platforms. It enables the creation of rich, visually stunning and interactive experiences that can run everywhere: within browsers and on multiple devices and desktop operating systems (such as the Apple Mac).

Once you know which daemon is running, then stop that daemon. To stop either inetd or xinetd, the easiest way is to run the init script that starts the daemon and instruct it to stop the daemon instead. You could also simply kill the process. Remember that this will generally also kill any services that the daemons are running. Enter the following: puppy$ /etc/rc.d/init.d/xinetd stop On a Debian system you can use the invoke-rc.d command. Enter the following: kitten$ invoke-rc.d inetd stop Now you need to stop inetd/xinetd from starting when your system runs. On a Red Hat system, simply use the chkconfig command. puppy$ chkconfig --del xinetd And on a Debian system, use the update-rc.d command. Enter the following: kitten$ update-rc.d -f inetd remove With the service stopped, you should neaten your system by deleting the associated inetd/xinetd files. Listing 3-28 shows the files you need to remove for inetd, assuming a Debian-style system. Listing 3-28. Removing the inetd Files kitten# rm -f /etc/init.d/inetd kitten# rm -f /etc/inetd.conf

And for xinetd, Listing 3-29 shows the files you need to remove assuming a Red Hat style or Mandrake-style system. Listing 3-29. Removing the xinetd Files puppy# rm -f /etc/rc.d/init.d/xinetd puppy# rm -f /etc/xinetd/conf puppy# rm -fr /etc/xinetd.d It is probably a good idea at this point to restart your system and test what connections are open using the ps -A and netstat -a commands to confirm all the services have been stopped. You can also remove the inetd and xinetd packages from your system using your chosen package management tool. This will guarantee the daemons cannot be used to penetrate or compromise your system.

Most system administrators manage systems to which they need to remotely connect. Sometimes these connections are made over the Internet to a remote location. In the past, the only tools available to administer your systems were telnet, ftp and the so-called r-tools, rcp, rlogin, and rsh. These tools are highly insecure. If you are still using any of these tools to administer your systems STOP NOW. These tools transmit all their information, including any passwords you input, in clear text with no encryption. Anybody sniffing on your network or monitoring devices your traffic passes through on the Internet can grab this information and use it to penetrate your systems. The r-tools would appear to offer marginal improvement on straight telnet by using the rhosts file to check that the user and source machine for the connection is valid and able to sign on. In reality this provides little or no comfort these days because it is incredibly simple to spoof a system to believe a connection is coming from a valid system. I will cover SSH, as implemented in the OpenSSH package, to replace these clear-text tools and additionally secure some of the other tools you can use for remote administration such as remote X-Windows, Webmin, and VNC. SSH stands for Secure Shell and is a command interface and protocol for establishing secure connections between systems. I will cover the free implementation called OpenSSH.