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are enabled. In many circumstances, it s quite possible to disable xinetd itself and all the services it normally handles, and if at all possible this is a recommended practice. xinetd is designed to be a secure replacement for inetd, but even so it still requires configuration. If you don t need the services it provides, then disabling it is simpler than maintaining it. Because network attacks come from the network, it s useful to know what network ports are in use and by what. You should have this view from both what the operating system thinks is in use and what an external scan shows. The easiest way to see what a server thinks is running is to use the netstat command. Given appropriate arguments (which may vary), netstat will show all the ports listening for external connections (see Figure 11-1). If the services running out of inetd have been reduced or eliminated, this list shouldn t be terribly large. However, not all network-based services are started out of inetd, so it s possible to find several open network ports that are running out of the system startup scripts. Because this is likely how Apache is launched, it shouldn t be too surprising to find other services started that way.

Here you see that this machine is running several services that you really don t need on the Web server. There s likely no reason for a machine to be running telnet, finger, nntp, ftp, biff, or a talk daemon. This machine appears to be running something on ports 80 and 8080, which are often used by Web servers. The ports in the 6000 6999 range are usually used for X11, which is fine for a Unix desktop machine but usually pointless for a Web server.

11

Note You will need sufficient permissions to create this directory structure. You may instead prefer to

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To know how to attack a machine, a malicious user will first do some research to see what services are available. The quick-and-dirty method of doing this is with a portscanner, which will systematically scan every port on a server and make a list of the ports that answer requests. This gives the attacker a lists of services to focus on, gain information about, and potentially exploit. Fortunately, the tools used to identify vulnerabilities can also be used by the administrator to make the server more secure. In fact, these tools are designed for security and just happen to also be used by crackers; if they weren t publicly available, a determined assailant could easily create their own. Having the tool available to everyone is better than not having one at all. One of the most popular network scanning tools is nmap. nmap is a flexible, freely available network mapper and probing tool and is available from the memorably named http://www.insecure.org/. Figure 11-2 shows what a typical use of nmap might generate.

5

keep the code for this book in your home directory. I chose to use /var/www since it is a commonly used area on web servers to hold web sites, and it is short and easy to refer back to when required. (On a typical Windows setup, you won t need any special permissions to create the required directories.)

In the event that a client asks for only Spanish, Italian, or Greek, this will cause the English variant to be selected using the previous LanguagePriority directive Similarly, if the client sends a request that states that French and German are equally acceptable (an entirely plausible scenario in Switzerland, for instance), you can use Prefer to have the French version, which is listed first in the LanguagePriority directive, selected This is the default, but you can request it explicitly with this: ForceLanguagePriority Prefer You can enable both modes of operation at once with this: ForceLanguagePriority Fallback Prefer The multiple choices are actually quite rare because they rely on the client sending proper quality settings for its language preferences Most clients don t do this and instead send a simple list such as the one I presented at the start of the section This is technically illegal in HTTP/1.

Coordination among these teams can sometimes be less than optimal, according to Kelley Eich, chief technology officer for the CDHS: At any given moment, if there s an incident or deviation from our policy, we could have four separate teams taking action, each without knowing what the others are doing, she explains When it comes to effectively and efficiently seeing and managing risks, this creates challenges That s no small management burden, considering that the agency must contend with 50 rules from HIPAA alone that govern the use of certain IT systems To better manage these IT policies and their associated risks, CDHS last year licensed CA GRC Manager It comes with prepopulated choices, Eich says, such as those that relate to our HIPAA mandates Having those criteria already available helps us to better manage these efforts right out of the box.

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