Java applet permissions (allow access to ports 1024 )

Hello everyone,
Not sure if this is the place to post this question but this forum has been extremely helpful to me in the past.
I'm interested in allowing a java applet to both edit my hosts file and bind to privileged ports (this is for a trusted corporate SSL VPN connection). I've tried editting my java.policy file, but it doesn't seem to affect anything. Even if I set a policy rule to temporarly allow ALL java applets to use privileged ports, it still won't work. Ditto for allowing write file permissions to /etc/hosts:
grant {
permission java.io.FilePermission "/etc/hosts", "write";
The only thing that seems to work is running firefox in root, which I really don't want to do.
Am I going about this the right way? Thanks!

If applet is signed, Change in Java Control Panel tab Security, Security Level to High.

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Abbreviated Java Console output:
Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03-384-10M3425 Java HotSpot(TM) 64-Bit Server VM
load: class ZeroApplet.class not found.
java.lang.ClassNotFoundException: ZeroApplet.class
    at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
    at sun.applet.AppletPanel.run(AppletPanel.java:368)
    at java.lang.Thread.run(Thread.java:680)
load: class JavaToJS.class not found.
java.lang.ClassNotFoundException: JavaToJS.class
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    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
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Hi, i am trying to create a java applet that allow
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those 3 points to create a circle. any help is
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Java applet detecting system states

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thanks in advance for the help!

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Windows messenger & parallels need access to port 1503

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Which firewall - OS X or Windows?
What networking model are you using - NAT; bridged; host only?
Do you have a hardware firewall that could be blocking it?

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The Java Wizard cannot run.
Please configure your browser to allow Java applets to access the filesystem.
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Firefox allows Java Applet with elevated permissions

I ended up with a virus on Friday when I selected "View" on an HTML attachment from the GMail web interface. The attachment started up java and proceeded to install the malware "Desktop Security 2010" and make changes to my system startup. I'm wondering how this happened and how to prevent it. My java security settings (Java Control Panel->Security->Certificates->Trusted Certificates) only lists Akamai Technologies and JavaFX as trusted certificates. Shouldn't that mean that I get prompted if any one else signs an applet that tries to run outside the sandbox? What else do I need to do to make sure that NO java applets run with elevated permissions?
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== This happened ==
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Accessing RS232 Port (Comm Port) from Applet

I have an interesting "problem". I would like to create an applet that allows me to read the Comm port of the client machine but obviously I get a security exception when I try to do this. Firstly is this possible (I know it can be done from an application)? If so, how would I go about doing it?
Thanks,
Rishi

you need to install the jre, and place the win32.dll at JavaSoft\JRE\1.3.1_06\bin, that properties file place at JavaSoft\JRE\1.3.1_06\lib, comm.jar at JavaSoft\JRE\1.3.1_06\lib\ext\
and in ur code try to use it to open ur com port
public String test() {
          String drivername = "com.sun.comm.Win32Driver";
          try
               CommDriver driver = (CommDriver) Class.forName(drivername).newInstance(); driver.initialize();
          catch (Throwable th)
               {* Discard it */}
          drivername = "javax.comm.*";
          try
               CommDriver driver = (CommDriver) Class.forName(drivername).newInstance(); driver.initialize();
          catch (Throwable th)
               {* Discard it */}
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM2")) {
//if (portId.getName().equals("/dev/term/a")) {
try {
serialPort = (SerialPort)
portId.open("SimpleWriteApp", 2000);
} catch (PortInUseException e) {}
try {
outputStream = serialPort.getOutputStream();
} catch (IOException e) {}
try {
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {}
                         int i=0;
                         while(true)
     try {
                                   messageString="hi";
                                   System.out.println(i++);
     outputStream.write(messageString.getBytes());
     } catch (IOException e)
                                   System.out.println(e);
                                   messageString=String.valueOf(e);
          return messageString;
and yet u need to signed the applet
1.     Compile the applet
2.     Create a JAR file
3.     Generate Keys
4.     Sign the JAR file
5.     Export the Public Key Certificate
6.     Import the Certificate as a Trusted Certificate
7.     Create the policy file
8.     Run the applet
Susan
Susan bundles the applet executable in a JAR file, signs the JAR file, and exports the public key certificate.
1.     Compile the Applet
In her working directory, Susan uses the javac command to compile the SignedAppletDemo.java class. The output from the javac command is the SignedAppletDemo.class.
javac SignedAppletDemo.java
2.     Make a JAR File
Susan then makes the compiled SignedAppletDemo.class file into a JAR file. The -cvf option to the jar command creates a new archive (c), using verbose mode (v), and specifies the archive file name (f). The archive file name is SignedApplet.jar.
jar cvf SignedApplet.jar SignedAppletDemo.class
3.     Generate Keys
Susan creates a keystore database named susanstore that has an entry for a newly generated public and private key pair with the public key in a certificate. A JAR file is signed with the private key of the creator of the JAR file and the signature is verified by the recipient of the JAR file with the public key in the pair. The certificate is a statement from the owner of the private key that the public key in the pair has a particular value so the person using the public key can be assured the public key is authentic. Public and private keys must already exist in the keystore database before jarsigner can be used to sign or verify the signature on a JAR file.
In her working directory, Susan creates a keystore database and generates the keys:
keytool -genkey -alias signFiles -keystore susanstore -keypass kpi135 -dname "cn=jones" -storepass ab987c
This keytool -genkey command invocation generates a key pair that is identified by the alias signFiles. Subsequent keytool command invocations use this alias and the key password (-keypass kpi135) to access the private key in the generated pair.
The generated key pair is stored in a keystore database called susanstore (-keystore susanstore) in the current directory, and accessed with the susanstore password (-storepass ab987c).
The -dname "cn=jones" option specifies an X.500 Distinguished Name with a commonName (cn) value. X.500 Distinguished Names identify entities for X.509 certificates.
You can view all keytool options and parameters by typing:
keytool -help
4.     Sign the JAR File
JAR Signer is a command line tool for signing and verifying the signature on JAR files. In her working directory, Susan uses jarsigner to make a signed copy of the SignedApplet.jar file.
jarsigner -keystore susanstore -storepass ab987c -keypass kpi135 -signedjar SSignedApplet.jar SignedApplet.jar signFiles
The -storepass ab987c and -keystore susanstore options specify the keystore database and password where the private key for signing the JAR file is stored. The -keypass kpi135 option is the password to the private key, SSignedApplet.jar is the name of the signed JAR file, and signFiles is the alias to the private key. jarsigner extracts the certificate from the keystore whose entry is signFiles and attaches it to the generated signature of the signed JAR file.
5.     Export the Public Key Certificate
The public key certificate is sent with the JAR file to the whoever is going to use the applet. That person uses the certificate to authenticate the signature on the JAR file. To send a certificate, you have to first export it.
The -storepass ab987c and -keystore susanstore options specify the keystore database and password where the private key for signing the JAR file is stored. The -keypass kpi135 option is the password to the private key, SSignedApplet.jar is the name of the signed JAR file, and signFiles is the alias to the private key. jarsigner extracts the certificate from the keystore whose entry is signFiles and attaches it to the generated signature of the signed JAR file.
5: Export the Public Key Certificate
The public key certificate is sent with the JAR file to the whoever is going to use the applet. That person uses the certificate to authenticate the signature on the JAR file. To send a certificate, you have to first export it.
In her working directory, Susan uses keytool to copy the certificate from susanstore to a file named SusanJones.cer as follows:
keytool -export -keystore susanstore -storepass ab987c -alias signFiles -file SusanJones.cer
Ray
Ray receives the JAR file from Susan, imports the certificate, creates a policy file granting the applet access, and runs the applet.
6.     Import Certificate as a Trusted Certificate
Ray has received SSignedApplet.jar and SusanJones.cer from Susan. He puts them in his home directory. Ray must now create a keystore database (raystore) and import the certificate into it. Ray uses keytool in his home directory /home/ray to import the certificate:
keytool -import -alias susan -file SusanJones.cer -keystore raystore -storepass abcdefgh
7.     Create the Policy File
The policy file grants the SSignedApplet.jar file signed by the alias susan permission to create newfile (and no other file) in the user's home directory.
Ray creates the policy file in his home directory using either policytool or an ASCII editor.
keystore "/home/ray/raystore";
// A sample policy file that lets a JavaTM program
// create newfile in user's home directory
// Satya N Dodda
grant SignedBy "susan"
     permission java.security.AllPermission;
8.     Run the Applet in Applet Viewer
Applet Viewer connects to the HTML documents and resources specified in the call to appletviewer, and displays the applet in its own window. To run the example, Ray copies the signed JAR file and HTML file to /home/aURL/public_html and invokes Applet viewer from his home directory as follows:
Html code :
</body>
</html>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
width="600" height="400" align="middle"
codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,1,2">
<PARAM NAME="code" VALUE="SignedAppletDemo.class">
<PARAM NAME="archive" VALUE="SSignedApplet.jar">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.3">
</OBJECT>
</body>
</html>
appletviewer -J-Djava.security.policy=Write.jp
http://aURL.com/SignedApplet.html
Note: Type everything on one line and put a space after Write.jp
The -J-Djava.security.policy=Write.jp option tells Applet Viewer to run the applet referenced in the SignedApplet.html file with the Write.jp policy file.
Note: The Policy file can be stored on a server and specified in the appletviewer invocation as a URL.
9.     Run the Applet in Browser
Download JRE 1.3 from Javasoft
good luck! [email protected]
i already give u many tips, i use 2 weeks to try this to success, hopw that u understand that, a result of success is not important, the process of how to get things done is most usefull!

Applet Permissions - lang.java.RuntimePermission exitVM.0

Hello All,
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     at java.lang.SecurityManager.checkExit(Unknown Source)
     at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
     at SketchApplet_new.createAndShowGUI(SketchApplet_new.java:56)
     at SketchApplet_new.init(SketchApplet_new.java:45)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
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I'm having the same problem i've used this tutorial to sign the jar file http://forums.sun.com/thread.jspa?threadID=174214, and i'm not being able to solve the problem

Java applets in a browser, and Serial port input

I know that there is a special package for serial port input in java. (java.Comm.SerialPort)
What I am trying to figure out before a final decision on design is made, is if there is anyway of reading serial port input into a java applet that is running inside of a browser.
I have found lots of reference to Serial port input, but nothing that really goes in the direction that I am lookind for.
Any little tid bits of information pertaining to this would be greatly appreciated.
Cuervo

You should also consider that applets are not allowed to access their client system's hardware without being signed; in other words, the user must agree (by clicking a button) to disable the applet security features. Why would you use an applet to do this? Applets are meant to be an extension of a website. You should use an application in this situation.

Java Applet to Access ASP Info in Proxy server Environment

I Have a Java Applet on a Web server outside and when I access the
applet in my corporate office which has a ProxyServer I get "UnKnownHost Exception".
I did used the "System.getProperties" methods giving the Proxy information and can pass through the Proxy Server.But that is not what I want,The Applet should get through
the Proxy server and get the response from the ASP without using the "System.getProperties".
IS THERE ANY WAY TO GET THE INFO. OF PROXY SERVER FROM THE CLIENT MACHINE ON WHICH THE APPLET RESIDES(PROXY HOSTNAME:, PROXY PORT)OR FROM THE BROWSER (IE/NETSCAPE)CAUSE THEY STORE THE PROXY INFO INTERNALLY--WHERE??? AND HOW DO I GET THAT?
Thanks in Advance

If you are using the Microsoft VM, and your applet is signed, you can use MS security to query the registry for the proxy server info.
For example:
com.ms.security.PolicyEngine.assertPermission(com.ms.security.PermissionID.REGISTRY);
com.ms.lang.RegKey key = new com.ms.lang.RegKey(com.ms.lang.RegKey.getRootKey(
com.ms.lang.RegKey.USER_ROOT,
"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
com.ms.lang.RegKey.KEYOPEN_READ);
String proxyServer = key.getStringValue("ProxyServer");However, if your client is using the Java plugin, this will not work. The Java Plugin loads the proxy server information based on the browser preferences, but I haven't figured out how to retrieve that proxy information from the Plugin itself. Sometimes the javaplugin.proxy.auto.url system property is null, even if the browser (MSIE) is configured to use an auto-configuration script/url for the proxy server configuration. I can see in the Java Console that the plugin knows the auto-config url.
Even if javaplugin.proxy.auto.url is not null, I don't know how to call the javascript function at that URL from within the applet to get the proxy server host name and port.
Does anyone know how to get the proxy information from the plugin?

Accidentally denied a Java Applet and now it wont load whenever i click allow

Hi Everyone,
I had a moment when i clicked Deny on an applet and now whatever i do i cant get it to run.
The applet came up with the message
"An applet from "URL" is requesting access to your computer.
The digital signature could not be verified.
Allow / Deny "
It has always come up with this and i have always allowed it and it has run no problem. It is a VPN Dial in style applet to allow a remote connection to work based systems. I have always run it on Safari after Firefox stopped letting it run and it has been fine. But now it just attempts to connect for forever and never getting anywhere.
I am running Mac OSX 10.6.8 with all updates completed.
I have tried Safari, Firefox and Chrome and none will let it launch.
I have reset Safari, cleared the Java Preferences Cache, looked for any exceptions but have been unable to find anything unusual.
Any help would be greatly appreciated.
Many thanks

Hi akahn,
Retaking the exam is between you and your professor, however for the page not letting you click on "stay on page" after two finger swiping.
This is a javascript feature that the developer put into the page you were taking the test on. If you disable javascript however, the page may not continue to work. And this hack [http://forums.mozillazine.org/viewtopic.php?f=38&t=2083577] may break the functionality of the page as well. But for future situations disabling specific handlers may be a work around.
I wonder if there is a temporary way to disable the two finger swipe for when you take the test, yep.
The config entry is mentioned here: [https://support.mozilla.org/en-US/questions/926002#answer-328219]
Sorry about the test, hope it ends up well.

Please, help me with file access in Java Applet.

import java.awt.*;
import java.applet.*;
import java.net.*;
public class ImageVi extends Applet {
     URL PicPath1;
     Image Img1;
     public void init()
          try
               PicPath1 = new URL("http://nurchi.far.ru/pic/s08.jpg");
          } catch (MalformedURLException Excep1) {}
     public void paint(Graphics g) {
          Img1=getImage(PicPath1);
          g.drawImage(Img1, 10, 10, this);
The error message is:
Exception occurred during event dispatching:
java.security.AccessControlException: access denied (java.net.SocketPermission nurchi.far.ru resolve)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:195)
at java.security.AccessController.checkPermission(AccessController.java, Compiled Code)
at java.lang.SecurityManager.checkPermission(SecurityManager.java, Compiled Code)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1019)
at sun.awt.image.URLImageSource.<init>(URLImageSource.java:48)
at sun.applet.AppletImageRef.reconstitute(AppletImageRef.java:40)
at sun.misc.Ref.get(Ref.java:53)
at sun.applet.AppletViewer.getCachedImage(AppletViewer.java:275)
at sun.applet.AppletViewer.getImage(AppletViewer.java:270)
at java.applet.Applet.getImage(Applet.java:190)
at ImageVi.paint(ImageVi.java:24)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:116)
at java.awt.Component.dispatchEventImpl(Component.java:2452)
at java.awt.Container.dispatchEventImpl(Container.java:1059)
at java.awt.Component.dispatchEvent(Component.java:2312)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:301)
at java.awt.EventDispatchThread.pumpOneEventForComponent(EventDispatchThread.java:120)
at java.awt.EventDispatchThread.pumpEventsForComponent(EventDispatchThread.java:95)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:90)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Applets are not allowed to connect to other server
than the one they were loaded from. This is probably
the reason here.You mean that I can use the applet after uploading on my web-site and using "getDocumentBase()" only?
OK.
The applet works perfectly if I use that function, but I have another question.
If I want to use something like:
Img1=getImage(getDocumentBase(), "s01.jpg");
it works perfectly.
If I do the fillowing:
Img1=getImage(getDocumentBase(), "pic/s01.jpg");
it also works.
But is it possible to go a level up?
Like:
Img1=getImage(getDocumentBase(), "../pic/s01.jpg");
That is if an applet is in one folder and the pictures are in another, but to get to them I have to go a level up and then enter another folder.
Please help.
Thanks.

Java applet permissions (allow access to ports 1024 )

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