I have JAR which is properly signed with a valid certificate from a trusted company. Im running an applet using HTML applet tag. My Manifest file includes following permissions:
Application-Name ="XYZ"
Permissions="all-permissions"
Codebase="*"
Trusted-Library="true"
I get the following warning message when running applet in browser:
I do not want this message to appear when my users open my applet. Can you advise me why this warning message is appearing and how to avoid it from appearing for my users?
Thanks!
how to avoid it from appearing for my users?
There is no way to avoid it. It is the choice of the user as to whether to run trusted code, and the decision of Sun/Oracle that they should be prompted.
Why exactly does the applet require all-permissions?
Related
For my education I often have to program math exercises for our site, which will be used in schools.
I had to port a .swf file to java applet, mainly because the .swf ran really slow.
The game/excercise worked fine in both Eclipse and my localhost, but when we put it on the site it always got blocked by Java.
I have read that you need a certificate, but that self signed certificates dont work.
I have tried to do it (Not sure if I was succesful), and the applet was still blocked.
What am I supposed to do to make it work?
Why don't you try Java Web Start instead of applets?
You chan check it at http://www.oracle.com/technetwork/java/javase/applet-migration-139512.html
From https://www.java.com/en/download/help/java_blocked.xml
Java has further enhanced security to make the user system less
vulnerable to external exploits. Starting with Java 7 Update 51, Java
does not allow users to run applications that are not signed
(unsigned), self-signed (not signed by trusted authority) or that are
missing permission attributes.
So, from Java 7 Update 51, users cannot run unsigned application (without a certificate), self-signed application (applications signed with a certificate that doesn't come from trusted authority), or applications missing Permission Attribute.
As the documentation says about self signed applications,
Applications of this type present the highest level of risk because
publisher is not identified and the application may be granted access
to personal data on your computer.
Also, as stated in the documentation, if you can still use self signed applications you need to add it to the exception site list,
As a workaround, you can use the Exception Site list feature to run
the applications blocked by security settings. Adding the URL of the
blocked application to the Exception Site list allows it to run with
some warnings.
First i would like to say that the .jar does not contain any malicious software or code. It's not harmfull, everything is fine. I signed my .jar and I'm trying to load it into my website using this code:
<applet width="765" height="503" code="Loader.java" archive="HolyDivinity718V1.1.jar" name="Holy Divinity"></applet></p>
But when i run it i get this error:
Application Blocked. Click for details. Your security settings have blocked a self-signed application from running.
The client is a webclient of a game that I'm running. What's the reason that it's getting blocked?
Since recently all self signed java applets are blocked. You can do one of the following things:
Buy and sign your applet with an official certificate
Decrease your security slider to medium
Use the exception site list
Sign your app with a self signed certificate and add your certificate to the java trust store
i wrote a web application which is used in our intranet. I alswo wrote a small Java Applet to integrate with our windows desktops (opening applications and files). Of course i get a security warning everytime i access my web application.
I've read on stackoverflow that it should be possible, to sign my applet and roll out the certificate to all my clients (Windows XP and Windows 7) to get rid of the securitywarning.
Is there a tutorial how to do that? Can i do that without purchasing a expensive certificate because i'm only using this application in my intranet?
Thx for any information and best regards!
I found the solution here: http://wikigu.blogspot.co.at/2011/06/signing-java-applet-with-your-own-ca.html
The last step is to install the generated crt (in the example it's the "server.crt") file into the Trusted Publishers certificate store.
Edit: i just realized that it is just working in Internet Explorer (applet is executed without any warning or dialogue) but not in Firefox. Firefox still shows a security warning. Does anybody know how to get rid of the warning in Firefox?
This may be old error but I am stuck here.
I created Java applet to access an Oracle database. I am going to put this applet in Local Network. My applet works fine in Eclipse and Netbeans but when I run through 'appletviewer' it goes at connection string and showing an error:
Error e java.security.AccessControlException: access denied (
"java.util.PropertyPermission" "oracle.net.wallet_location" "read")
I already signed applet using this Oracle technique for Signed Applets.
I used the user of database who has full rights. Also when I run using policy file, it shows the same error.
How do I connect the applet to the database successfully?
The HTML used to load the applet is:
<applet
code=tree.pacg.DrawApplet.class
codebase=c:\tree\pacg
archive=DrawApplet.jar,ojdbc14.jar
height="800"
width="1000">
</applet>
Its solved !!
I signed the ojdbc14.jar file and it works !!
also I create new policy file and gave it 'All' access permission then it also work through 'appletviewer'
Thanks..Thank you sir..
when i run the applet in ie, it show security warning Java has discovered application components that could indicate a secuirty concern.
Something like this?
BTW - if you click No at this point, the code should not be blocked and should therefore run.
But even seeing that dialog is a nuisance. If it can be confusing to developers, it is bound to be confusing to an end user.
See Mixing Signed and Unsigned Code
Ensuring Application and Applet Security for an explanation of this behavior. But see particularly Deploying Signed Applications and Applets Securely Without a Mixed Code Warning for how to allow mixing of unsigned & signed code.
The other alternative - to sign all Jars using the same certificate - also works, but is sometimes forbidden by deployment licenses or other factors.
On signing the code.
Me.
3) ojdbc14.jar needs to be digitally signed when deploying this way. Is ojdbc14.jar digitally signed?
OP.
3) ojdbc14.jar is a oracle database drivers so that they are already signed
..followed 4 hours later by..
I signed the ojdbc14.jar file and it works !!
I was wondering if anybody can show me way to be able to create read file permissions for my java applet.
The exact exception I receive is
java.security.AccessControlException: access denied(java.io.FilePermission filename.pdf write)
I've put f.setReadable and f.setWriteable where f is the file and nothing. A little help please.
There's security limits on what an unsigned applet can do, and one of the things it can't do is access the local filesystem (see here for a full list). You have several options:
Sign your applet. If a user then runs your applet it won't run with any security restrictions. However, signing your applet with a trusted certificate costs at least $100 a year, and if you self-sign then nobody is going to trust your applet. And even if you do sign with a trusted certificate the user might decide not to run it.
Set up your applet with a JNLP file. This will let your applet use the javax.jnlp package. You can then use the FileOpenService and FileSaveService to ask the user to let you read/write one particular file. Alternatively, you can use the PersistenceService to store a small amount of data persistently within the browser.