# Re: Socket in Applet

Jan Luehe (luehe@laguna.eng.sun.com)
Mon, 3 May 1999 08:32:07 -0700 (PDT)

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    Message-Id: <199905031532.IAA12296@laguna.eng.sun.com>

    Date: Mon, 3 May 1999 08:32:07 -0700 (PDT)

    From: Jan Luehe <luehe@laguna.eng.sun.com>

    Subject: Re: Socket in Applet

    To: java-security@java.sun.com, TLangford@witsys.com

Tony:

You need to run your browser with the Plug-in in order to take
advantage of the JDK 1.2 security features.

See

http://java.sun.com/products/plugin/
for more details.

Jan

> From: Tony Langford <TLangford@witsys.com>
> To: "'java-security@java.sun.com'" <java-security@java.sun.com>
> Subject: Socket in Applet
> Date: Mon, 3 May 1999 10:12:54 -0400
> MIME-Version: 1.0
>
>
> I'm having problems opening a socket in an applet that's running in a
> browser. Here's my situation: I'm using JDK1.2.1 in JBuilder 2 under
> Windows NT. I have added a permission to the policy file to allow any
> codebase permission to open a socket to any host on port 3000, i.e....
>
> grant {
> permission java.net.SocketPermission "*:3000", "accept, connect, listen,
> resolve";
> permission java.net.SocketPermission "TLANGFORD:3000", "accept, connect,
> listen, resolve";
> };
>
>
> In my code I'm opening a socket in the applet's "start". "TLANGFORD" is a
> machine on our intranet...
>
> // Start the applet
> public void start ()
> {
> SecurityManager security = System.getSecurityManager ();
>
> if (security != null)
> {
> try
> {
> security.checkConnect ("TLANGFORD", 3000);
> }
> catch (SecurityException sex)
> {
> textArea1.append ("no can do on the socket,
> dude!" + newline);
> return;
> }
> }
>
> // establish socket connection first off, and create in
> and out streams
> try
> {
> echoSocket = new Socket ("TLANGFORD", 3000);
> out = new PrintWriter (echoSocket.getOutputStream
> (), true);
> in = new BufferedReader (new InputStreamReader
> (echoSocket.getInputStream ()));
> }
> catch (NumberFormatException err) // thrown from
> "parseInt"
> {
> return;
> }
> catch (UnknownHostException err) // from "new
> Socket"
> {
> textArea1.append ("DONT'T KNOW ABOUT HOST" +
> newline);
> return;
> }
> catch (IOException err) // from
> "new Socket"
> {
> textArea1.append ("COULDN'T GET I/O FOR CONNECTION"
> + newline);
> return;
> }
> }
>
>
> When I run the applet in the browser, in addition to the "no can do" message
> in my text box, I get this in the Java console:
>
> com.ms.security.SecurityExceptionEx[hello/Hello.start]: cannot access
> "TLANGFORD":3000
> at com/ms/security/permissions/NetIOPermission.check
> (NetIOPermission.java)
> at com/ms/security/PolicyEngine.deepCheck (PolicyEngine.java)
> at com/ms/security/PolicyEngine.checkPermission (PolicyEngine.java)
> at com/ms/security/StandardSecurityManager.chk
> (StandardSecurityManager.java)
> at com/ms/security/StandardSecurityManager.chkex
> (StandardSecurityManager.java)
> at com/ms/security/StandardSecurityManager.checkConnect
> (StandardSecurityManager.java)
> at hello/Hello.start (Hello.java:93)
> at com/ms/applet/AppletPanel.securedCall0 (AppletPanel.java)
> at com/ms/applet/AppletPanel.securedCall (AppletPanel.java)
> at com/ms/applet/AppletPanel.processSentEvent (AppletPanel.java)
> at com/ms/applet/AppletPanel.run (AppletPanel.java)
> at java/lang/Thread.run (Thread.java)
>
> I have an environment variable "java.home" set to the directory containing
> the "\lib\security" directory, which is where the policy file is located.
> What else am I supposed to do to get this to run? Anything?
>
> Thanks for any help,
> Tony Langford
> TLangford@witsys.com
>
>

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