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The SQL UNION syntax instructs the database to combine the result sets of two SELECT statements. In this case, the attacker has arranged for the first SELECT statement to return an empty result set by injecting a 1=0 (i.e., false) into the WHERE clause of the first SELECT statement. He then uses UNION to combine this empty result set with the result set of the second injected SELECT statement, whose result columns were chosen to match the data types of the first statement. Thus, the preceding statement has the effect of returning the result of the query SELECT cardholder, number, exp_month, exp_year FROM creditcards to the application in a result set with the columns pizza, toppings, quantity, and order_day. The application, in turn, takes the rows of the result set and transcribes them into the order history HTML table. As a result, the attacker receives an HTML document from the web server that contains the entire contents of the creditcards table in an HTML table (Figure 8-3 shows what the page might look like in a browser): <TABLE> <TR><TD>Pizza</TD> <TD>Toppings</TD> <TD>Quantity</TD> <TD>Order Day</TD> </TR> <TR><TD>Neil Daswani</TD> <TD>1234 1234 9999 1111</TD> <TD>11</TD> <TD>2007</TD> </TR> <TR><TD>Christoph Kern</TD> <TD>1234 4321 3333 2222</TD> <TD>4</TD> <TD>2008</TD> </TR> <TR><TD>Anita Kesavan</TD> <TD>2354 7777 1111 1234</TD> <TD>3</TD> <TD>2007</TD> </TR> ... </TABLE>

Now that you know how to customize setup.py, let s look at how to package the SimpleSite application. Pylons applications are designed to be distributed as .egg files. This is the same format that Pylons itself and all its dependencies are distributed in. You ll remember from 2 that applications distributed as eggs can be installed with Easy Install. This means that if your Pylons application is published on the Python Package Index, other users will be able to install it with Easy Install too. Let s start by looking at how to build an egg.

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A combo box can be used like a list widget when only the current item is shown. An alternate use is to provide the users with a list of items, but also enable them to write their own texts. You control whether the user can type in custom text by using the editable property. When the user picks an item from the list, the activated(int) and activated(const QString&) signals are emitted.

The first step of building an egg is to remove any unnecessary files that you don t want packaged. In this case, this includes any of the YUI library files the application is not using. By looking at Firebug s Net tab when using the application, you can see that only the following files are being used: /css/main.css /yui/2.6.0/animation/animation-min.js /yui/2.6.0/assets/skins/sam/blankimage.png /yui/2.6.0/assets/skins/sam/editor-sprite.gif /yui/2.6.0/assets/skins/sam/editor-sprite-active.gif /yui/2.6.0/assets/skins/sam/skin.css /yui/2.6.0/assets/skins/sam/sprite.png /yui/2.6.0/connection/connection-min.js

Figure 8-3. Pizza order history after SQL injection Using the UNION syntax to combine an injected SELECT clause with the original query that the programmer had intended to be executed, the attacker was able to retrieve data from an entirely different database table than the one the original query referred to. The attacker can potentially inflict even greater damage by using the ; statement separator to instruct the database to execute a second separate statement, which in this case is not restricted to also be a SELECT statement.3 For example, the attacker might arrange for the request parameter month to evaluate to 0; DROP TABLE creditcards; Then, the queries executed by the database will be SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND order_month=0; DROP TABLE creditcards; That is, after retrieving data from the orders table, the database is instructed to remove the table creditcards from the schema. As such, this constitutes a DoS attack; after this statement is executed, future orders might fail, or the application might initiate delivery of a pizza without being able to charge users credit cards after the order is fulfilled.

When you need to iterate in a specialized way or just want to access a specific item, you can always use indexed access with the [] operator or the at method. For a QList, this process is very quick. For example, the following line calculates the sum of the sixth and eighth element of a list: int sum = list[5] + list.at(7);

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