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Using cookies to automatically access user accounts on web sites is popular with portals such as Yahoo and Excite, but they are not the best security mechanism You have to consider that the computer being used by the client can be shared, thus enabling direct access to the user account from a public machine The other thing to consider is that not all users know or understand what a cookie is, so when proposing the use of one, ask the user a clear question related to the intended use and effect of the cookie When dealing with sensitive information always ask for an additional password so as to add a level of security to the possible conditions previously described
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If the browser does not allow for cookies, an alternative mechanism called URL rewriting can be used It is so called because instead of keeping the HTTP session identification in a cookie, it appends it to the end of the URL For example, the following URL:
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http://localhost:7001/samplejsp Would be converted to:
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http: //localhost:7001/samplejsp WebLogicSession=large_string To enable this feature the following properties must be set as shown when WebLogic is started:
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weblogichttpdsessionenable=true weblogichttpdsessionURLRewritingenable=true weblogichttpdsessioncookiesenable=true
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This mechanism is particular useful when working with WAP devices, as the micro-browsers in WAP telephones do not allow cookies The problem is that the session ID created as a default by WebLogic is too large for a WAP phone Most of these devices are limited to 128 characters for a URL In these cases, the weblogic httpd session sessionlDLengthURL property can be changed to specify the generation of smaller session IDs
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Pizzas and Cookies
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The Wonder Troops are ready to try out the cookies They decide to do so with the code that was developed in 6, where they converted the front end from the ASP web site of E-Pizza Taking into consideration all the things they have learned, they decide to compromise with the use of the cookies A cookie will be used only to remember the user identification in the application The user will still be prompted for a password to gain access to the web site To do this, the troops create Register, jsp, which handles: Q User registrations Q
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Changes of identity Q User authentication
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This JSP page verifies that the user wants to have a cookie enabled, in which case a cookie with a lifetime of 1 year is sent to the browser If the user does not desire this, a cookie with a lifetime of zero is sent to the browser A lifetime of zero means that the cookie will be available only for the session If the user had a "persistent" cookie this will invalidate it This is done with the following code:
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//remove the cookie by default int age = 0; if (isChecked(request, "remember")) { //add the cookie Systemoutprintln("adding the cookie"); age = (60 * 60 * 24 * 365); } else { //remove the cookie Systemoutprintln("removing the cookie"); } Cookie thisCookie = new Cookie("EPizza", (String)sessiongetAttribute("UserlD")); thisCookiesetPath("/"); thisCookiesetMaxAge(age); responseaddCookie(thisCookie); /* //cookie trace: Systemoutprintlnl"Cookie added: "+ thisCookie); Systemoutprintln("name: " + thisCookiegetName()); Systemoutprintln("value: " + thisCookiegetAttribute()); Systemoutprintln("age: " + thisCookiegetMaxAge()); Systemoutprintln("path: " + thisCookiegetPath()); Systemoutprintln("domain: " + thisCookiegetDomain()); */ sessionsetAttribute("UserlsNew", "true"); responsesendRedirect("indexj sp"); return;
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The isChecked () method is declared at the beginning of this page as follows:
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protected boolean isChecked(HttpServletRequest request, String checkbox) { return ((requestgetParameter(checkbox) != null) && (requestgetParameter(checkbox)equals("1"))); } %>
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The Customer table in the database and the Customer class were modified to add the following fields (from Customer Java):
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c_wianie
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VARCHAR (20) ,
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* * *
c_password
c_company c_phone_exc c_ept C_user_level
VARCHAR{20),
VARCHAR[20), VAHCHAR(IO), VARCHAR(IO), NUMBER(3),
c_email
VARCHAR(30),
public public pxJslic pxiblic public public public
String String String String String int String
c_uname c password c_company c_phorie_ext c_apt c_user_level c_email
= ""; = "" ; = " ; = ""; = ""; = 0; = "";
With all these changes done, when a visitor connects to the web site for the first time there is no E-Pizza cookie present in the browser, so they are presented with the standard welcome screen, If the visitor registers, they activate the remember option, basically telling the application to send a cookie to the browser If the user has selected the browser option that will alert them every time, and a web site wants to deposit a cookie, they will get a dialog screen as shown here: