Setting Up Secure Connections in Font

Generation DataMatrix in Font Setting Up Secure Connections

Setting Up Secure Connections
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Secure connections are extremely easy to program with MIDP because all the work is done behind the scenes for you. The idea is that the application developer doesn t need to be concerned with the details of how the underlying secure socket is created; it s enough to know you want to use one and then leave the details to the application management software. To use a secure connection, you need to get an instance of HttpsConnection instead of HttpConnection or get an instance of SecureConnection instead of SocketConnection. To get the right connection, all you need to do is send the right URL to the method Connector.open(). It couldn t be simpler. Once you have a handle to the Connection, you can get information about it by calling getSecurityInfo() to get the corresponding SecurityInfo object. The SecurityInfo object will give you more details about the protocol, the cipher suites, and the server s certificate.
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Using HTTPS
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HTTPS is the standard protocol that most browsers use for communicating securely. It s just the same as HTTP except that communication takes place over a secure connection using the SSL protocol. Because of MIDP s generic connection framework, switching a game from using HTTP to HTTPS is just as simple as changing the URL. On the client side, that s the only change you need to make. The MIDP classes will take care of creating the right type of connection for you as long as the URL is right. Generally you need to change the http:// at the beginning of the URL to https:// and change the port number if the server listens for HTTP and HTTPS messages on different ports. (Consult your server configuration to find out what port it s listening on for HTTPS connections, and keep in mind that many operator networks will not allow HTTP connections on nonstandard ports.) In my test version of the Dungeon game from the previous chapter, the URL changed from http://frog-parrot.net:8080/games/DungeonDownload to https://frog-parrot.net:8443/games/DungeonDownload. And that was the only change
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CHAPTER 8 SECURING YOUR APPLICATIONS
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I needed to make in my client code. (Remember to use your own domain name or Internet Protocol [IP] address instead of frog-parrot.net when testing because my Servlet isn t usually running on this site.) On the server side, the code doesn t need to change at all. A Servlet doesn t care if it s being served over HTTP or HTTPS. It s just a question of configuring your server to use HTTPS. (Consult the documentation; it shouldn t be very hard.) The hardest part is setting up the certificate. If you re planning to communicate with real clients over the Internet using HTTPS, then you ll need a real certificate. See the earlier Using Digital Certificates section for more information. If you d like to test locally, you can just create your own certificate. This is also discussed in the Using Digital Certificates section. You have one additional step to perform when using HTTPS with the emulator and a self-signed certificate: you must import the server s certificate into the emulator s keystore. If you don t do this, the emulator won t recognize the server s certificate and will refuse to connect (unless it s a real certificate from a CA and not just a self-signed certificate). To import the server s certificate into the emulator s keystore, you can use KToolbar as explained in the Using Digital Certificates section or use the MEKeytool utility that comes with the MIDP toolkit. With my configuration, the command I used was the following (all on one line): java -jar ~/j2me/WTK2.0/bin/MEKeyTool.jar -import -alias tomcat -MEkeystore ~/j2me/WTK2.0/appdb/_main.ks -storepass changeit This command is loaded with options, but most of them are self-explanatory. The beginning (java -jar ~/j2me/WTK2.0/bin/MEKeyTool.jar) merely tells the machine to run MEKeytool. The -import option gives the command to import a certificate. Since I didn t include the option -keystore, MEKeytool assumes that the certificate should be read from the default keystore at ~/.keystore. The -alias tomcat option tells it to use the certificate that has the alias tomcat. (The certificate has that alias because it s the certificate that my Tomcat server is using). The -MEkeystore ~/j2me/WTK2.0/appdb/_main.ks option tells MEKeytool that the destination keystore is ~/j2me/WTK2.0/appdb/_main.ks, which is the default keystore for the emulator (assuming that the toolkit was installed in the directory ~/j2me/). Then, obviously, the option -storepass changeit gives the password needed to read from the server s keystore. You ll almost certainly have to modify the options a bit if you run this command on your own system, but if the modifications you need to make aren t obvious, the toolkit s HTML documentation covers MEKeytool. Once you ve made these modifications on both the test client and test server, your development environment will make connections through HTTPS.
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