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Section formats include margins; page orientation; page borders; vertical alignment; headers, footers, and page numbers; footnotes and endnotes; columns; and line numbers. Settings for paper size and paper source for a printer are also included in section formats. Each section can have its own formats. Many sections are automatically created, but you can also create new sections manually.

s If you want, you can also download and install chkconfig on a Debian system. You can find a source Tip

version that will compile on Debian at http://www.fastcoder.net/~thumper/software/sysadmin/

ASP.NET MVC will not throw an exception, so be sure any output is encoded when rendered in the browser using the Server.HtmlEncode method (you should be doing this in ASP.NET anyway because the detection is pretty poor): <%= Server.HtmlEncode(strMyValue) %> You could also use the new HTML encode syntax (see 10 for more details): <%: strMyValue %>

chkconfig/.

Your init scripts are not the only place where services are started. You should also review the contents of the inittab file in the /etc directory. Though its use to start services is rarer these days, some items still end up in this file. Red Hat systems, for example, place several services in this file, including a trap for the Control+Alt+Delete key combination. Additionally, tty terminals are often started in this file. Listing 1-10 shows some service lines in the inittab file. Listing 1-10. inittab Service sysacc:235:acct:/usr/sbin/acct -q -d ~~:S:wait:/sbin/sulogin ca::ctrlaltdel:/sbin/shutdown -t3 -r now The first line shows starting a service called sysacc. The line is broken down into the name of the service being started, the run levels the service will start at, a label for the service, and the command and any options to run separated by colons. servicename:runlevels:label:command -option -option You should review all commands being started in this file and determine if they are all needed. If you want to remove a service, simply comment out or delete that line.

The second line in Listing 1-10 shows a trap I have added specifically for Red Hat systems. Red Hat allows booting into single-user mode by typing linux single on the LILO command line or the Grub boot-editing menus. This line forces the execution of the command /sbin/sulogin if single-user mode is started (run level S). The /sbin/sulogin requires the root password be to be entered before single-user mode will be started. See the sulogin man page for more information. The third line in Listing 1-10 shows a trap for the Control+Alt+Delete key combination commonly used to reboot systems.

Another problem that can occur with web applications is Cross-Site Request Forgery (CSRF). CSRF attacks occur by a user being authenticated to a particular site and then activating code that is constructed to perform a request on the logged-in site. For example, I could be logged into my bank account, open an e-mail that has an embedded image with a URL such as http://www.bank.com withdraw=10000&to=badPerson. Because I am logged in to the site, this action would then be performed. MVC contains support for preventing these attacks by generating a secure token. For more information on this please refer to http://blog.codeville.net/2008/09/01/prevent-cross-site-request-forgery-csrf-using-aspnetmvcs-antiforgerytoken-helper/.

s Linux pays attention only to the Control+Alt+Delete key combination when used from the console Tip

or virtual consoles. For users who are logged into the system via other means for example, a terminal session pressing these keys will do nothing.

By default most Linux kernels trap this key combination when pressed and pass it to the init system for processing This allows you to specify the action taken when the Control+Alt+Delete key combination is pressed The default action is usually to run the shutdown command I recommend securing this a bit further by adding the -a option to the trap in Listing 1-10 ca::ctrlaltdel:/sbin/shutdown -a -t3 -r now The -a option enables the use of the shutdownallowed file Create a file called shutdownallowed in the /etc directory Add the users you want to be authorized to use the shutdown command to the file, one username per line You can also have comments and empty lines in this file Listing 1-11 shows what is inside the sample shutdownallowed file Listing 1-11 Sample shutdown.