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Would a blank Java security policy file be the most restrictive?


Would a blank Java security policy file be the most restrictive?

By : user2954538
Date : November 22 2020, 10:31 AM
should help you out Yes, a security policy that grants no permissions is the most restrictive policy you can define with the standard Java Security Manager, and would prevent any code running in that JVM from doing anything that requires a security permission. The Java core API's generally check some variety of security permission before allowing code running under a Security Manager from doing anything that could be harmful, so in theory it's safe to run untrusted code where no permissions have been granted.
There are some exceptions: for example code loaded from the system classpath is allowed to call System.exit(), which would stop your application, and code running with no permissions can still create any number of new threads, which could lock up the system. If these are concerns you'll need to consider writing a custom Security Manager.
code :
grant codeBase "file:path/to/trusted/application/jars" {
  permission java.security.AllPermission;
};


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Java security policy file question

Java security policy file question


By : user3077930
Date : March 29 2020, 07:55 AM
seems to work fine Make sure you run the editor you use to edit the file (e.g. notepad) as Administrator -- otherwise the file permissions set on that directory will not allow you to modify the file. Right click on notepad, select "Run as administrator" then load the file in notepad, edit it and save it and that should work.
Can I guarantee that my Java application will be executed with a Security Manager with a restrictive policy?

Can I guarantee that my Java application will be executed with a Security Manager with a restrictive policy?


By : sspwin
Date : March 29 2020, 07:55 AM
Does that help Your analysis is correct, you cannot have such a guarantee.
Your program is executed by the Java virtual machine. Whatever property you want to require of the JVM, you have to ask it “does this property hold?”. So you'd be asking the JVM “do you protect my application against the people who are running you?”, and the people who are running that JVM can configure it to lie — just say “yes” even though the answer is no. At most you would require a minor patch to the JVM, and probably not even that as whoever wants to see your application run can just fire up a debugger.
Injecting iframe into page with restrictive Content Security Policy

Injecting iframe into page with restrictive Content Security Policy


By : Ömer Kala
Date : March 29 2020, 07:55 AM
like below fixes the issue
The inability to insert an external iframe in Chrome is a bug (crbug.com/408932).
code :
{
    "name": "Embed external site",
    "version": "1",
    "manifest_version": 2,
    "content_scripts": [{
        "js": ["contentscript.js"],
        "matches": ["*://*/*"],
        "all_frames": true
    }],
    "web_accessible_resources": [
        "frame.html"
    ]
}
// Avoid recursive frame insertion...
var extensionOrigin = 'chrome-extension://' + chrome.runtime.id;
if (!location.ancestorOrigins.contains(extensionOrigin)) {
    var iframe = document.createElement('iframe');
    // Must be declared at web_accessible_resources in manifest.json
    iframe.src = chrome.runtime.getURL('frame.html');

    // Some styles for a fancy sidebar
    iframe.style.cssText = 'position:fixed;top:0;left:0;display:block;' +
                           'width:300px;height:100%;z-index:1000;';
    document.body.appendChild(iframe);
}
<style>
html, body, iframe, h2 {
    margin: 0;
    border: 0;
    padding: 0;
    display: block;
    width: 100vw;
    height: 100vh;
    background: white;
    color: black;
}
h2 {
    height: 50px;
    font-size: 20px;
}
iframe {
    height: calc(100vh - 50px);
}
</style>
<h2>Displaying https://robwu.nl in a frame</h2>
<iframe src="https://robwu.nl/"></iframe>
Make Angular working with restrictive Content Security Policy (CSP)

Make Angular working with restrictive Content Security Policy (CSP)


By : AL Hussainee
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The problem has been solved using last Angular CLI version (starting with 1.0.0-beta.17). The following command serves a working application because it includes a-head-of-time compilation.
code :
ng serve --prod
set java security policy via parameter instead of file

set java security policy via parameter instead of file


By : Michael Ben Haym
Date : March 29 2020, 07:55 AM
wish help you to fix your issue There is no way to do that, you can only specify URL to another security policy file.
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