Self signed applets are not supported by plug-in

I am using Windows 2000.I am using self signing applet which i have signed with the help of netscape signing tool with test certificate.I have put the zip file in "c:\program Files\netscape\users\default " directory
after signing..While opening it is giving some exception
"java.lang.SecurityException: cannot verify signature block file META-INF/ZIGBERT".
please help me regarding this.
ashok das
otlsoft, bangalore.

First you need to install your self signed sertificat into system - only then you'll be able to start applet without problem.

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Why my self-signed applet could not read local disk but could write?

I used a self-signed certificate for the applet yesterday and it worked
fine at the beginning time, that is, it could write/read file to/from
local disk, and it could connect to other MDS servers. But later, a
problem happens. It could write file to local disk(I tested it and created
files to C:/ under windows) but when it try to read that file, it got a
io acessing exception. It could connect to other servers. I am puzzled
about this problem, and I wonder why I could write but could not
read. Need I deal with any policy file issue here?

hi,
i 'am doing something which is similar to the stuff ur doing .I wanted to write into file on the local disk on which the applet is running.for this i have signed the applet .do i need to make it self signed wat is difference between the self signed and signed applet .The problem which i facing is that it still gives me the security exception even if i define the policy file for that applet............Can u help me reagrding this
Thanks in advance
your great help would be apprecriated
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What are the default permissions for "self-signed" applets?

Hello!
I have a self-signed applet (=signed with a self made certificate) and under most plugin-enviroments java asks the user if it accepts this certificate as trustworth.
On my linux-box I do not have any problems to write files to the local filesystem after I accepted this self-signed applet.
However I've often read that users must grant some permissions even for signed applets, so is there a list of permissions that are denied by default?
Are there differences between java releases starting with 1.2.2?
Thanks in advance, lg Clemens

Default settings are like you said, jre asks the user and everything will work.
Unless.your applet uses classes that are not signed like with calls from javascript to your applet the plugin.jar is used and you'll get an exception when writing to files.
When writing to files the OS might not allowe the user to write to a certain file or folder.
Don't know what type of exception will be thrown if the OS doesn't allowe it but it has
nothing to do with applet permissions.
To change the default setting you can add the following line in the grant { bit of the
java.policy
permission java.lang.RuntimePermission "usePolicy";
When this line is there all signatures will be ignored and an applet can only do extra
things (like access to local files) if a policy is set up for this applet.
To find out what's wrong at your clients site you should ask them to send a full trace
and check that. I hope you did a .printStacktrace() on the exception in your code so
you can see if any other classes are involved when the exception is thrown.
To turn the full trace on (windows) you can start the java console, to be found here:
C:\Program Files\Java\j2re1.4...\bin\jpicpl32.exe
In the advanced tab you can fill in something for runtime parameters fill in this:
-Djavaplugin.trace=true -Djavaplugin.trace.option=basic|net|security|ext|liveconnect
if you cannot start the java console check here:
C:\Documents and Settings\userName\Application Data\Sun\Java\Deployment\deployment.properties
I think for linux this is somewhere in youruserdir/java (hidden directory)
add or change the following line:
javaplugin.jre.params=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
for 1.5:
deployment.javapi.jre.1.5.0.args=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
The trace is here:
C:\Documents and Settings\your user\Application Data\Sun\Java\Deployment\log\plugin...log
I think for linux this is somewhere in youruserdir/java (hidden directory)

Signed applet does not grant AudioPermission "record"

From what I gather, if I have a trusted signed applet sitting on a webpage and
the visitor accepts (runs) the applet, then they should not need to have:
grant {
permission javax.sound.sampled.AudioPermission "record";
in their java policy file. Well I have done all this (with a certificate from
Thawte) and posted a thorough example at:
http://www.livesite.net/JavaSoundTest
At the bottom of that page there is a "Check permissions" link which will alert
true/false if we have record permission. Clicking any "Record" link will
attempt to open a TargetDataLine.
My experience (and problem) is: record permission must be granted even though
the applet is signed by a trusted CA.
I would very much appreciate any help.
Are you able to record/playback (without granting record permission in your
java policy files) with the JavaSoundTest applet webpage?
Is there something I am missing?
------ More information ------
Java Control Panel -> Advance -> Security
'allow user to grant permissions to signed content' is checked
Reproducable on:
MS NT4 w/ IE6
MS Windows 2000 w/ Firefox 1.5
MS Windows XP w/ Firefox 1.5
MS Windows XP w/ IE6
Fedora FC6 w/ Firefox 2.0
Also, this happens with a commented-out record permission in the user
.java.policy file, or when the policy file does not exist.
------ Source code: opening the target data line ------
Using the JavaSoundTest applet page without granted permission, clicking a
record link will yield this exception in the java console:
java.security.AccessControlException: access denied (javax.sound.sampled.AudioPermission record)
at java.security.AccessControlContext.checkPermission
at java.security.AccessController.checkPermission
at java.lang.SecurityManager.checkPermission
at com.sun.media.sound.JSSecurityManager.checkRecordPermission
at com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen
at com.sun.media.sound.AbstractDataLine.open
at net.livesite.jsound.Recorder.run(Recorder.java:161)
while opening a TargetDataLine as:
23 private static TargetDataLine line;
157 line = (TargetDataLine) AudioSystem.getLine( lineInfo );
158
159 try
160 {
161 line.open( format, (int) format.getSampleRate() );
162 }
------ Source code: Using the security manager ------
The "Check permissions" link on the TestJavaSound applet page calls this method:
191 public boolean hasSoundRecPriv()
192 {
193 boolean ret = false;
194
195 try
196 {
197 SecurityManager sm = System.getSecurityManager();
198 if (sm != null)
199 {
200 sm.checkPermission(new AudioPermission("record"));
201 }
202 ret = true;
203 }
204 catch(SecurityException e)
205 {
206 ret = false;
207 }
208
209 return ret;
210 }
(This is a continued post from JAVASOUND-INTEREST at SUN.COM)

Is there something I am missing?1) Applets are not well supported by Sun,
and are inherently problematic as a reult
of that.
2) My experience suggests that the diagnotics
applet is not reliable for detecting JMF.
3) I guess the JMF applet is doing checks of
policy files, despite the signed code.
You might circumvent most of these problems,
by using web-start to launch an application.
Here are some of my tests at launching
JMF using web-start.
http://www.javasaver.com/testjs/jmf/

Self signed applet problem

Hello java gurus,
I have a self signed applet which must read and write from mysql DB.
The sign is OK, the popup "warning security" is here but I still have a SQL Exception :
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I don't want to change the java policy and I work on plugin 1.4.1_02.
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From the plug-in control panel, click certificates
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accept as valid for signed code. Obviously, if any
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it wouldn't provide much security. For a purely
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Moderator's Note: The title of this post has been edited as it is created as a new topic.

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Self signed applets are not supported by plug-in

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