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Figure 8-14 Beware if you re asked to type your password out of the blue and for no apparent reason Updating your system: Always ensure that your system software is completely up-to-date As with Windows, many Ubuntu programs have bugs that lead to security holes Crackers target such vulnerabilities Downloading the latest versions of Ubuntu software ensures that you not only get the latest features, but also any patches for critical security holes As with most versions of Linux, updating Ubuntu is easy, and, of course, it s also free of charge You ll learn how to get online updates in the next section Locking up your PC: Attacks can be either remote or local, so in addition to online security, you should limit who has physical access to your computer.

Any Ubuntu system can be compromised by a simple floppy boot disk, or even by just selecting the rescue mode entry on the boot menu, which provides the user with root access to the computer This is for obvious reasons; the idea of a boot disk or the rescue mode is to let you fix your PC should something go wrong, and you cannot do this if you re blocked from accessing certain files When Linux is used on servers that hold confidential data, it s not uncommon for the floppy and CD-ROM drives to be removed, thus avoiding booting via a boot disk Such computers are also usually locked away in a room or even in a cupboard, denying physical access to the machine Another option might be to add a BIOS password to the computer, meaning you ll be prompted for it during the boot process.

The zone files of your DNS server are stored in the /etc/bind directory, and the name of these files typically starts with db (although nothing says that you have to name them this way). The file named.conf specifies where to look for these database files. The next part you need to understand is how this file is structured to define your DNS zone. Listing 9-6 provides an example. Listing 9-6. Contents of the example.com Zone File RNA:/ # cat /etc/bind/db.example.com $TTL 2D @ IN SOA SFO.example.com. 2006080700 3H 1H 1W 1D ) example.com. example.com. sfo lax web IN IN IN IN IN MX NS A A CNAME 10 mail.example.com. lax.example.com. 201.100.100.10 201.100.100.40 sfo.example.com.

Listing 9-7. A Join Expressed with a Calculus-like Expression SELECT m.LastName, e.TourID FROM Entry e, Member m WHERE e.MemberID = m.MemberID AND m.MemberType = 'Senior' Listing 9-8. A Join Expressed with an Inner Join Operation SELECT m.LastName, e.TourID FROM Entry e INNER JOIN Member m ON e.MemberID = m.MemberID WHERE m.MemberType = 'Senior'

The method for setting this up depends on your computer type, but generally, look for the BIOS Setup option when the computer is booting Obviously, make sure you never forget a BIOS password, because a computer that doesn t boot is not very useful..

The Ubuntu notification area (the equivalent of the Windows system tray) at the top right of the screen contains a program that automatically monitors the package repositories and tells you when updates are available. This is the Update Manager. If you haven t yet updated your system, this icon will have

As you can see, the zone file starts with generic settings. First, the TTL 2D parameter specifies a validity of 2 days if your slave server cannot synchronize with the master. Next to be defined are the SOA settings for your server, which are the settings for the authoritative name server of this domain. Notice the mail address for the administrator of your DNS server: root.SFO.example.com. After that, you see the following synchronization settings: serial: This number should be changed every time that you change the database on the master server. By changing it, a slave server that wants to synchronize with the master server can see that an update has occurred and start the zone transfer. Notice that the serial number typically consists of the current year, current month, and current day, followed by two digits that indicate the event number. For example, after the third change on December 12, 2007, the serial number would be 07121202. refresh: This indicates the interval used on a slave server between updates from the zone information at the master server. retry: If the update fails the first time the slave server tries to synchronize, this interval specifies how long it should wait before trying again. expiry: If a slave server fails to contact the master server for a longer period, this setting indicates how long before the information at the slave server expires. After expiration, the slave server no longer answers DNS queries. minimum: This is the length of time that a negative response is cached on this server. Following the generic information, you can see the definition of the resource records. In the previous example, only the four most common resource records are used. (A more complete overview was provided in Resource Records earlier in this chapter.)