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In Eshopx, we defined our own servlet (ShopServlet.java) to implement the controller part of the MVC architecture. In Eshopf, we replaced our servlet with the standard FacesServlet. As a result, we almost entirely rewrote the web.xml file from scratch. In particular, we replaced this servlet element used in the web.xml version of Eshopx: <display-name>ShopServlet</display-name> <servlet-name>ShopServlet</servlet-name> <servlet-class>eshop.ShopServlet</servlet-class> with this: <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> We also changed the servlet-mapping element from this: <servlet-name>ShopServlet</servlet-name> <url-pattern>/shop/*</url-pattern> to this: <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.jsf</url-pattern> To access the database containing books, book categories, and orders, we defined the initialization parameters jdbcDriver, dbURL, dbUserName, and dbPassword in Eshopx. They were used in ShopServlet to set up an object of type DataManager, which implemented the model part of the MVC architecture and interfaced to the database. The replacement of ShopServlet with FacesServlet forced us to implement a different mechanism in Eshopf for passing the database parameters to the data manager. We defined the database as a resource external to the application by creating the context.xml file in the META-INF folder with the following content: <Context debug="5" reloadable="true" crossContext="true"> <Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource" username="root" password="" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/shop" maxActive="8" maxIdle="4"/> </Context>

The effects of an unexpected command suddenly appearing in a stream of input are highly applicationspecific. Some commands may simply create harmless PHP errors. It is not difficult, however, to imagine scenarios where carefully crafted user input could bypass authentication routines or initiate downstream applications. The ways in which commands can be inserted into input include the following: Attackers may inject commands into SQL queries (we will discuss preventing this kind of attack in 3). Any script that sends email is a potential target for spammers, who will probe for ways to use your script to send their own messages. Network socket connections often use escape sequences to change settings or terminate the connection. An attacker might insert escape sequences into values passed over such a connection, which could have highly destructive consequences. Cross-site and remote shell scripting are potentially the most serious kinds of command injection vulnerabilities. We will discuss preventing these kinds of attacks in s 4 and 5.

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Run the application, and log in and then log out. Then try to check out, and it should ask you to log in again. You may notice that there is no space between the Login link and the Logout link. To fix this, modify catalog.xhtml as shown in Listing 4-46. Listing 4 46. Inserting a Space

We then registered the resource in the web.xml file as follows: <resource-ref> <res-ref-name>jdbc/mysql</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> To complete the transition from Eshopx to Eshopf, we also removed the definition of the initialization parameters base and imageURL from web.xml, because they were no longer needed, and we added the element to direct Tomcat to perform the basic authentication needed to access the resource. Listing 5-19 shows the full web.xml file of Eshopf.

The PHP language itself can be tweaked so as to add a bit of protection to your scripts. You control the behavior of the language (or at least those parts of it that are subject to independent control) by setting directives in php.ini, PHP s configuration file. In this section, we discuss one of PHP s environment settings that has an important influence on your scripts vulnerability to user input register_globals. The notorious register_globals directive was turned on by default in early versions of PHP. This was certainly a convenience to programmers, who took advantage of the fact that globalization of variables

CSS lets you define new styles by adding attributes to already defined styles. This cascading mechanism is a form of inheritance, and therefore it requires an underlying hierarchical structure. CSS uses the structure provided by HTML documents instead of creating its own. This is fine as long as you write the HTML code yourself or generate it with JSP When you use JSF, . though, the control you have on the generated HTML is reduced. As a result, you have to pay greater attention when designing the style sheets. When converting Eshopx to Eshopf, we encountered this issue in several places and had to modify the style-sheet file accordingly. We mentioned a specific example in the f:view, h:form, and h:outputText section of 5. In general, if you compare the files eshop.jspx of Eshopx and eshopf.jspx of Eshopf, you ll see that there are a dozen differences. In fact, this issue concerning style sheets is a disadvantage of using JSF, but it becomes less and less important as you become familiar with the HTML code that JSF generates. Furthermore, you ll normally start developing directly with JSF. When converting Eshopx into Eshopf, we were dealing with an existing user interface that we wanted to alter as little as possible.

... <h:form> <h:commandLink action="login" value="Login"/> <h:outputText value=" "/> <h:commandLink value="Logout"> <f:actionListener type="shop.LogoutActionListener"/> </h:commandLink> </h:form> </body> </html>

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