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Read about cross-scripting attacks (see 9) if you are writing a web site; about SQL injection attacks if your application talks to a database; about the sordid history of privilege escalation attacks if your system will support users who have different permission levels; and about viruses and Trojan horses if you are writing an e-mail client Fifth and finally, since you will probably lack the time (not to mention the omniscience) to build your entire application out of perfect code, try to focus on the edges of your code where it interacts with data from the outside.

Sometimes it is helpful to limit the ways in which selections can be made. For example, you might want to limit the user to selecting only one item at a time (or to select only entire rows).

Several minutes spent writing code to examine a web form variable, checking it every which way to make sure it really and truly looks like, say, a string of digits, can be worth hours of precaution further inside the program that will be necessary if the bad value can make it all the way to the database and have to be dealt with there It was a great day, to take a concrete example, when C programmers stopped thinking that their servers had to always run as root which had risked the compromise of the entire machine if something were to go wrong and instead wrote network daemons that would start up, grab the low-numbered port on which their service lived, and then immediately drop their privileges to those of a normal user.

This limitation is controlled with the selectionBehavior and selectionMode properties of each view. Because it is controlled on a view level, it is important to remember that as soon as the selection model is shared between two views, both views need to have their selectionBehavior and selectionMode properties set up properly. The selection behavior can be set to SelectItems, SelectRows, or SelectColumns (which limits the selections to individual items, entire rows, or entire columns, respectively). The property does not limit how many items, rows, or columns the user can select; it is controlled with the selectionMode property. The selection mode can be set to the following values: NoSelection: The user cannot make selections in the view. SingleSelection: The user can select a single item, row, or column in the view. ContiguousSelection: The user can select multiple items, rows, or columns in the view. The selection area must be in one piece, next to each other without any gaps. ExtendedSelection: The user can select multiple items, rows, or columns in the view. The selection areas are independent and can have gaps. The user can choose items by clicking and dragging, selecting items while pressing the Shift or Ctrl keys. MultiSelection: Equivalent to ExtendedSelection from the programmer s viewpoint, the selection areas are independent and can have gaps. The user toggles the selected state by clicking the items. There is no need to use the Shift or Ctrl keys. In Listing 5-7, the table view is configured to allow only one entire row to be selected. Try selecting multiple items and single items by using the tree and list views. Listing 5-7. Changing the selection behavior table->setSelectionBehavior( QAbstractItemView::SelectRows ); table->setSelectionMode( QAbstractItemView::SingleSelection );

They almost seemed to consider it a contest to see how few lines of code they could leave in the part of their program that ran with root privileges And this brought about a vast reduction in exposure Your Python code is the same way: fewer lines of code that run before you have verified the sanity of an input value, or tested for a subtle error, mean that less of the surface area of your program can harbor bugs that enemies could exploit But, again, the subject is a large one Read blogs like Schneier on Security, watch vendor security announcements like those on the Google Online Security Blog, and consult good books on the subject if you are going to be writing lots of security-sensitive code.

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