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You can enable smrsh by adding the feature in Listing 7-24 to your sendmail.mc file. Listing 7-24. Enabling SMRSH in Sendmail FEATURE(`smrsh',`/usr/sbin/smrsh') Ensure the second option /usr/sbin/smrsh is the location of your smrsh binary. Then create your /usr/adm/sm.bin directory to hold your safe programs.

s Some distributions change the default location for the smrsh programs directory. Use the command Tip

Your code should now look similar to the following: public partial class MainMenu : UserControl { public MainMenu() { InitializeComponent(); this.Loaded += new RoutedEventHandler(MainMenu_Loaded); } void MainMenu_Loaded(object sender, RoutedEventArgs e) { this.cmdStackPanel.Click += new RoutedEventHandler(cmdStackPanel_Click); } void cmdStackPanel_Click(object sender, RoutedEventArgs e) { PageNavigator.LoadPage(newLayout.StackPanelTest()); } } Now press F5 to run the application. Click the Stack Panel button and you should see a screen similar to Figure 14-8.

strings /path/to/smrsh | grep '^/' to find the directory. One of the directories returned should be the smrsh directory.

You should populate your smrsh safe programs directory with only those programs you believe cannot be compromised or used for hacking purposes. So, do not include the perl interpreter, sed, awk, or the like. And do not include shells such as sh or csh, as this defeats the purpose of having a secure shell. I usually include programs such as mail and vacation and, if you use them, programs such as maildrop and procmail. When populating your safe programs directory, the easiest method is to simply symbolically link in the required programs.

Figure 5-79 You can easily swtich between Professional and Linear formats. By default, Word automatically enters an equation in a professional format, which is a two-dimensional format (see Figure 5-80). For example, exponents are shown as superscripts, and fractions are displayed with the numerator above the denominator. Click the Professional button to convert an equation to the two-dimensional format.

Starting with version 8.7, Sendmail also has the ability to control how delivery is made to files, including defining a safe directory environment in the form of a limited chroot jail. Ordinarily, Sendmail will write to any file or object it has permission to write to, including ordinary files, directories, and devices. This poses a serious risk if Sendmail were to write over something crucial or if an attacker was able to overwrite something that created a vulnerability or hole in your security. The SafeFileEnvironment option handles the ability to control how delivery is made to files. Enabling it can achieve two possible outcomes. The first is to restrict delivery to ordinary files only, and the second to create an area to which Sendmail must write its files. Listing 7-25 simply declares the option in sendmail.mc, which restricts delivery to ordinary files only. Listing 7-25. Setting SafeFileEnvironment define(`confSAFE_FILE_ENV', `/') With the SafeFileEnvironment declared as / or root, Sendmail will now to refuse to write to anything except a normal file. This includes banning writes to directory, devices, and, importantly for some systems, symbolic links. The only exception to this is that it is still possible for Sendmail to write to /dev/null. Turning this option on is a good idea as a bare minimum to prevent an inadvertent or malicious write by Sendmail to some critical location.

Figure 14-8. Laying out items with the StackPanel Try changing the Orientation of the StackPanel to Horizontal to see how it affects the positioning of the squares. StackPanel is a very useful control and is very flexible. It is used extensively to perform tasks such as laying out lists of elements and creating menus.

The second way to use the SafeFileEnvironment option is to define a directory or directory tree in which all files that Sendmail wants to write to must be contained. This applies only to delivery to files. This does not include things such as your aliases, include files, maps, or anything written by a delivery agent such as procmail. Listing 7-26 shows how you can define a directory. Listing 7-26. Setting SafeFileEnvironment define(`confSAFE_FILE_ENV', `/safe') Sendmail will chroot into the /safe directory before making any writes. But Sendmail also is careful to check that you are not referencing the safe directory twice. For example, if your alias file contains the following: jim: \jim, /safe/home/jim/jim.old

and your SafeFileEnvironment option is set like Listing 7-26, then Sendmail will strip off the extra /safe in your aliases file before writing.

s Note The \ in front of jim tells Sendmail to write immediately ignoring any other aliasing, including