Roadblock 1 5 9 – Content Blocker Google Chrome

1. Roadblock 1 5 9 – Content Blocker Google Chrome Extension
2. Roadblock 1 5 9 – Content Blocker Google Chrome Browser
3. Roadblock 1 5 9 – Content Blocker Google Chrome Pop Ups
4. Roadblock 1 5 9 – Content Blocker Google Chrome

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In order to mitigate a large class of potential cross-site scripting issues, Chrome's extension system has incorporated the general concept of Content Security Policy (CSP). This introduces some fairly strict policies that will make extensions more secure by default, and provides you with the ability to create and enforce rules governing the types of content that can be loaded and executed by your extensions and applications.

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In general, CSP works as a block/allowlisting mechanism for resources loaded or executed by your extensions. Defining a reasonable policy for your extension enables you to carefully consider the resources that your extension requires, and to ask the browser to ensure that those are the only resources your extension has access to. These policies provide security over and above the host permissions your extension requests; they're an additional layer of protection, not a replacement.

On the web, such a policy is defined via an HTTP header or meta element. Inside Chrome's extension system, neither is an appropriate mechanism. Instead, an extension's policy is defined via the extension's manifest.json file as follows:

For full details regarding CSP's syntax, please take a look at the Content Security Policy specification , and the 'An Introduction to Content Security Policy' article on HTML5Rocks.

Default Policy Restrictions

Packages that do not define a manifest_version have no default content security policy. Those that select manifest_version 2, have a default content security policy of:

This policy adds security by limiting extensions and applications in three ways:

Eval and related functions are disabled

Code like the following does not work:

Evaluating strings of JavaScript like this is a common XSS attack vector.Instead, you should write code like:

Inline JavaScript will not be executed

Inline JavaScript will not be executed. This restriction bans both inline </code> blocks <strong>and</strong> inline event handlers (e.g. <code><button></code>).</p>

The first restriction wipes out a huge class of cross-site scripting attacks by making it impossible for you to accidentally execute script provided by a malicious third-party. It does, however, require you to write your code with a clean separation between content and behavior (which you should of course do anyway, right?). An example might make this clearer. You might try to write a Browser Action's popup as a single popup.html containing:

Three things will need to change in order to make this work the way you expect it to:

• The clickHandler definition needs to move into an external JavaScript file (popup.js would be a good target).

• The inline event handler definitions must be rewritten in terms of addEventListener and extracted into popup.js.

  If you're currently kicking off your program's execution via code like , consider replacing it by hooking into the document's DOMContentLoaded event, or the window's load event, depending on your needs. Below we'll use the former, as it generally triggers more quickly.

• The setTimeout call will need to be rewritten to avoid converting the string 'awesome(); totallyAwesome()' into JavaScript for execution.

Those changes might look something like the following:

Only local script and and object resources are loaded

Script and object resources can only be loaded from the extension's package, not from the web at large. This ensures that your extension only executes the code you've specifically approved, preventing an active network attacker from maliciously redirecting your request for a resource.

Instead of writing code that depends on jQuery (or any other library) loading from an external CDN, consider including the specific version of jQuery in your extension package. That is, instead of:

Download the file, include it in your package, and write: Finch for inbox 2 1 download free.

Relaxing the default policy

Inline Script

Up until Chrome 45, there was no mechanism for relaxing the restriction against executing inline JavaScript. In particular, setting a script policy that includes 'unsafe-inline' will have no effect.

As of Chrome 46, inline scripts can be allowed by specifying the base64-encoded hash of the source code in the policy. This hash must be prefixed by the used hash algorithm (sha256, sha384 or sha512). See Hash usage for elements for an example.</p><h3>Remote Script</h3><p> If you have a need for some external JavaScript or object resources, you can relax the policy to a limited extent by allowlisting secure origins from which scripts should be accepted. We want to ensure that executable resources loaded with an extension's elevated permissions are exactly the resources you expect, and haven't been replaced by an active network attacker. As man-in-the-middle attacks are both trivial and undetectable over HTTP, those origins will not be accepted. <a href='https://heredload380.weebly.com/translate-it-2-1-1.html'>Translate it 2 1 1</a>.</p><p> Currently, developers can allowlist origins with the following schemes: <code>blob</code>, <code>filesystem</code>, <code>https</code>, and <code>chrome-extension</code>. The host part of the origin must explicitly be specified for the <code>https</code> and <code>chrome-extension</code> schemes. Generic wildcards such as <code>https:</code>, <code>https://*</code> and <code>https://*.com</code> are not allowed; subdomain wildcards such as <code>https://*.example.com</code> are allowed. Domains in the Public Suffix list are also viewed as generic top-level domains. To load a resource from these domains, the subdomain must explicitly be listed. For example, <code>https://*.cloudfront.net</code> is invalid, but <code>https://XXXX.cloudfront.net</code> and <code>https://*.XXXX.cloudfront.net</code> can be allowlisted.</p><p> For development ease, resources loaded over HTTP from servers on your local machine can be allowlisted. You may allowlist script and object sources on any port of either <code>http://127.0.0.1</code> or <code>http://localhost</code>.</p><p> The restriction against resources loaded over HTTP applies only to those resources which are directly executed. You're still free, for example, to make XMLHTTPRequest connections to any origin you like; the default policy doesn't restrict <code>connect-src</code> or any of the other CSP directives in any way.</p><p> A relaxed policy definition which allows script resources to be loaded from <code>example.com</code> over HTTPS might look like:</p><p> Note that both <code>script-src</code> and <code>object-src</code> are defined by the policy. Chrome will not accept a policy that doesn't limit each of these values to (at least) <code>'self'</code>.</p><p> Making use of Google Analytics is the canonical example for this sort of policy definition. It's common enough that we've provided an Analytics boilerplate of sorts in the Event Tracking with Google Analytics sample extension, and abrief tutorial that goes into more detail.</p><h3>Evaluated JavaScript</h3><p> The policy against <code>eval()</code> and its relatives like <code>setTimeout(String)</code>, <code>setInterval(String)</code>, and <code>new Function(String)</code> can be relaxed by adding <code>'unsafe-eval'</code> to your policy:</p><p> However, we strongly recommend against doing this. These functions are notorious XSS attack vectors.</p><h2>Tightening the default policy</h2><p> You may, of course, tighten this policy to whatever extent your extension allows in order to increase security at the expense of convenience. To specify that your extension can only load resources of <em>any</em> type (images, etc) from its own package, for example, a policy of <code>default-src 'self'</code> would be appropriate. The Mappy sample extension is a good example of an extension that's been locked down above and beyond the defaults.</p><h2>Content Scripts</h2><p> The policy that we have been discussing applies to the background pages and event pages of the extension. How they apply to the content scripts of the extension is more complicated.</p><p> Content scripts are generally not subject to the CSP of the extension. Since content scripts are not HTML, the main impact of this is that they may use <code>eval</code> even if the extension's CSP does not specify <code>unsafe-eval</code>, although this is not recommended. Additionally, the CSP of the <em>page</em> does not apply to content scripts. More complicated are <code><script></code> tags that content scripts create and put into the DOM of the page they are running on. We will refer to these as DOM injected scripts going forward.</p><p> DOM injected scripts that would be executed immediately upon injection into the page will execute as you might expect. Imagine a content script with the following code as a simple example: This content script will cause an <code>alert</code> immediately upon the <code>document.write()</code>. Note that this will execute regardless of the policy a page may specify.</p><p> However, the behavior becomes more complicated both inside that DOM injected script and for any script that does not immediately execute upon injection. Imagine that our extension is running on a page that provides its own CSP that specifies <code>script-src 'self'</code>. Now imagine the content script executes the following code: If a user clicks on that button, the <code>onclick</code> script will <em>not</em> execute. This is because the script did not immediately execute and code not interpreted until the click event occurs is not considered part of the content script, so the CSP <em>of the page</em> (not of the extension) restricts its behavior. And since that CSP does not specify <code>unsafe-inline</code>, the inline event handler is blocked.</p><p> The correct way to implement the desired behavior in this case would be to add the <code>onclick</code> handler as a function from the content script as follows: </p><p> Another similar issue arises if the content script executes the following: In this case, the script <em>will</em> execute and the alert will pop up. However, take this case: While the initial script will execute, the call to <code>eval</code> will be blocked. That is, while the initial script execution is allowed, the behavior within the script will be regulated by the page's CSP.</p><p> Thus, depending on how you write DOM injected scripts in your extension, changes to the page's CSP may affect the behavior of your extension. Since content scripts are <em>not</em> affected by the page's CSP, this a great reason to put as much behavior as possible of your extension into the content script rather than DOM injected scripts.</p> <h2 id='roadblock-1-5-9-content-blocker-google-chrome-extension'>Roadblock 1 5 9 – Content Blocker Google Chrome Extension</h2><p>Whether it's to limit distractions during study time or to protect kids from unwanted content, it's important to know how to block websites in Chrome on Windows. Website blocking is a way to ensure that harmful, violent, or sexual content doesn't reach people you don't want exposed to it. From a self-discipline point of view, it's useful to force yourself to get productive work done, instead of scrolling through 9GAG all day long. Read on to find out how to do this.</p><p>Read: Here are 4 Ways To Block Websites on Android</p><h3>1. Block Site – Chrome Web Extension</h3><p>The easiest way to block unwanted websites in Chrome is to use a Chrome web extension. We prefer to use Block Site. It's simple and robust. It lets you both whitelist and blacklist websites. It also gives you the option to block website URLs that contain specific words (e.g. violent or sexual terms).</p><p>You can password protect the extension's options page to make it harder to uninstall. This is the main drawback though. Even if you can't uninstall it, you could always just uninstall Chrome. Or use a different browser, for that matter.</p><p><strong>Pros: </strong></p><ul><li>Very easy to set up, practically a one-click install</li><li>Robust featureset</li></ul><h2 id='roadblock-1-5-9-content-blocker-google-chrome-browser'>Roadblock 1 5 9 – Content Blocker Google Chrome Browser</h2><p><strong>Cons:</strong></p><ul><li>Chrome itself can be uninstalled</li><li>You can simply use a different browser</li></ul><h3>2. FocusMe</h3><p>This is a tool that I've written about before. It's very useful for removing distractions so you can be more productive. However, it also has very robust website blocking capabilities. Once you install the app, FocusMe lets you configure black and whitelists for blocking websites. You can schedule time periods in which to block these sites or simply set it to unlimited. You can also password-protect your settings.</p><p>The highlight is that this blocks access to these sites globally: even if you were to use a browser other than Chrome, you still wouldn't be able to bypass it. Moreover, it can actually close tabs if you try to open up a tab to a given website. The main drawback is that FocusMe is premium software with a hefty yearly subscription of $30. We wouldn't recommend buying it <em>just </em>to block websites.</p><p><strong>Pros:</strong></p><ul><li>Black and whitelisting functionality</li><li>Highly survivable–it can prevent you from uninstalling</li><li>Can block more than just websites</li></ul><p><strong>Cons:</strong></p><ul><li>Costs $30 per year</li></ul><h3>3. Windows Host File</h3><p>The hosts file is kind of like an address book that your computer uses–it maps particular URLs to corresponding IP addresses. Of course, the host file doesn't have to host <em>all </em>of these for all websites (that's what a DNS server is for). That doesn't mean you can't add in your own definitions. If you want to block access to a site on Chrome, one nifty trick is to edit the host file.</p><p>Your host file's in the System32 directory. You open it up, type the localhost loopback IP address (127.0.0.1), then type in the URL you want to block. Instead of going to the site, your system will just loop back to itself. If you're trying to use the hosts file to block web access, it works best with limited user accounts. A standard user won't have administrative privileges to edit the hosts file so they'll be unable to gain access to the site.</p><p>Alternately, you can check out our list of best Host File Editor for Windows 10, Host File Editor lets you directly edit the hosts file without moving the original file.</p><p><strong>Pros:</strong></p><ul><li>Blocks the site globally, not just in Chrome</li><li>Users with standard accounts won't be able to undo the website block</li></ul><p><strong>Cons:</strong> Luxion <a href='https://reuwoodciekin1979.mystrikingly.com/blog/luxion-keyshot-pro-9-0'>keyshot</a> pro 9 0.</p><ul><li>You have to manually enter each site you want to block</li><li>Users with admin privileges can simply revert the changes</li></ul><h3>4. OpenDNS Web Filtering</h3><p>This is a slightly more complicated solution, but it works great. Remember what I said about DNS servers? They're what tell your computer what IP address corresponds to what URL. Your ISP will have you connected to a particular default DNS server but you can configure your router to use a better provider like OpenDNS. Once your router's set to use OpenDNS, you'll want to create an OpenDNS account.</p><p>This gives you the option to let the DNS server filter out unwanted websites for you. If you're assigned a static IP address, you just need to give this to OpenDNS. If your ISP assigns you a dynamic IP address, you'll have to install an extra piece of software that communicates dynamic IP changes to OpenDNS. After you do all this, the blocked sites on your OpenDNS dashboard will no longer be available to <em>anyone </em>connected to that particular router.</p><p><strong>Pros:</strong></p><ul><li>Block access to unwanted sites for anyone connected to your router</li><li>System-wide block: uninstalling Chrome doesn't let you bypass it</li></ul><p><strong>Cons:</strong></p><ul><li>Relatively harder to configure and requires basic networking know-how</li><li>Doesn't let you have granular, user-level access control</li></ul><h3>5. Windows 10 Family Settings</h3><p>Windows 10 has a range of family settings that let you monitor and restrict access family members' access to your computer. This includes the option to enable website filtering. You need to set up a Windows family group for this to work. There are two classes of users: adults and kids. Adult users have access to the user account privileges for kids. They can blacklist websites which will then not be accessible to kids when they use any browser, including Chrome.</p><p>Kids don't have access to the settings. The main drawback here is that all users in the group need to have actual Microsoft accounts, making this less useful for temporary situations. It's also less useful if you're trying to prevent yourself from accessing particular websites</p><p><strong>Pros:</strong></p><ul><li>Blocks website access system-wide</li></ul><p><strong>Cons:</strong></p><h2 id='roadblock-1-5-9-content-blocker-google-chrome-pop-ups'>Roadblock 1 5 9 – Content Blocker Google Chrome Pop Ups</h2><ul><li>All users need a Microsoft account</li><li>Not very useful for self-monitoring</li></ul><h3>6. Router-based blocking</h3><p>This approach is similar to the DNS server approach we'd mentioned earlier. Many routers themselves have the option to block particular websites. Some have more robust functionality than others, and some don't have this feature at all. If your router does have a 'block websites' feature, it'll usually be present under the Security heading. You can set what websites you want blacklisted and you may also be able to set schedules for blocking.</p><p>If you're lucky, your router might have MAC address-based website blocking built in. This will let you block specific websites for specific MAC addresses. This means that only the devices you want to restrict site access will be restricted.</p><p>There are drawbacks here, though. While you can set a username and password to restrict router access, it's always possible for other users to hard reset the router and undo your changes.</p><p><strong>Pros:</strong></p><ul><li>Systemwide website block that goes beyond just Chrome</li><li>Can be used if target users have local admin privileges</li></ul><p><strong>Cons:</strong></p><ul><li>The router can be hard reset</li><li>Not all routers have all the functionality mentioned here</li></ul><h2 id='roadblock-1-5-9-content-blocker-google-chrome'>Roadblock 1 5 9 – Content Blocker Google Chrome</h2><h3>7. Cold Turkey</h3><p>This is for really hardcore users who don't want any blocking slip-ups. Cold Turkey is similar to FocusMe in that it's an app that deliberately restricts your access to apps and websites. Unlike FocusMe, the default setting prevents you from disabling it. It's got very extensive uninstall protection built in. The website blocker is robust and lets you whitelist and blacklist sites, besides settings time limits and breaks.</p><p>Dedicated uninstaller software like Revo <em>can </em>be used to get rid of it. If a user wanted to get really creative, they could copy this over on a pen drive and proceed to uninstall Cold Turkey. But the app has strong enough uninstall protection that you really will have to go out of your way to cheat it.</p><p>There are drawbacks too, of course. While the default version is free the Pro version costs $30. Moreover, Cold Turkey is <em>really </em> <a href='https://tripharinan1974.mystrikingly.com/blog/photolemur-2-2-0-automated-photo-enhancement-software' title='Photolemur 2 2 0 – automated photo enhancement software'>Photolemur 2 2 0 – automated photo enhancement software</a>. serious about its block times. If you accidentally enable it for a long period, you will literally not be able to access your system, short of taking drastic measures.</p><p><strong>Pros:</strong> <a href='https://downwup974.weebly.com/image-editor-0-61-download-free.html'>https://downwup974.weebly.com/image-editor-0-61-download-free.html</a>.</p><ul><li>Very robust uninstall protection</li><li>Lots of website-blocking features, like scheduling, whitelisting etc</li></ul><p><strong>Cons:</strong></p><ul><li>Pro version is expensive</li><li>Overzealous uninstall protection can make your life hard if you accidentally enable Cold Turkey</li></ul><p>Each of these website blocking solutions has its benefits and drawbacks. If you're just looking to block Chrome websites, the BlockSite extension offers great functionality, with support for whitelisting and blacklisting. The drawback, of course, is that other browsers won't be protected. FocusMe and Cold Turkey have very robust blocking and uninstall protection features. However, they can cost quite a bit. And sometimes, they can be a bit too zealous: If you accidentally enable Cold Turkey, you might not be able to use your system for a few hours.</p><p>The Hosts file tweak is a very simple way of restricting access to specific sites, but it only really works if the users your setting up for don't have administrative privileges. Otherwise, they can just rollback your changes. Windows Family group is a great way to limit your kids' access to the internet. In theory. In practice, it's a bit messy to set up, since everyone needs to have their own Microsoft account.</p><p>And lastly, the DNS and router-based approaches work great and are safe from users with local admin privileges. Physical access to the router is a problem, though, since users can just reset it.</p><p>There is no fool-proof way to block websites on Chrome or on Windows in general. However, a combination of these options and some smart policymaking can go a long way.</p><p>Also Read: How to Block Inappropriate Websites on Android</p><br><br><br><br>