Webpack content security policy

Posted on 24.01.2021 Comments

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Content Security Policies

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webpack content security policy

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Already on GitHub? Sign in to your account. This is really just a conceptual question to make sure that I understand the philosophy and core technology of the project. From my cursory overview of the project, it appears to work by inserting and updating style elements into the DOM. This seems to me to be incompatible at a base level with Content Security Policy security headersspecifically the style-src header.

For example, In order to get the react integration to work, the tightest security policy I am able to set is default-src 'self'; style-src 'unsafe-inline' blob:.

Is this conflict an implementation detail that could be potentially mitigated, or am I correct in assessing that it's a root conceptual incompatibility? I haven't researched this topic. All we do is we create a style tag and insert css rules by using style. I would be happy to add more information about this to the documentation, are you interested to contribute?

Ah yes that tweet thread is very informative. The dynamic nonce creation definitely seems the way to go and it's great that there's work being done in webpack. I'm happy to contribute, though it may take quite some time. Seems as though I'm the only one searching for this feature in this project at the moment though so I'm happy to slowly chip away at it. We recently added support for this in styled-componentsif you go through the PR history you should find the PR somewhere.

Looks like this line is the special sauce? MDN notes the following:. The server must generate a unique nonce value each time it transmits a policy. See unsafe inline script for an example. I found it very hard impossible to generate a unique nonce for every page visit, as webpack must know the nonce at bundle time unless I'm missing somethingwhile the server must know the nonce at runtime for including it in the CSP rules. If anyone have any suggestions, please let me know, but for now, I'm using a hard-coded Baseencoded guid value.

I'm using Helmet for misc security concerns. They also have a good tutorial on CSP. When loading the initial index page, the Content-Security-Policy header should contain.Content Security Policy is a standard that has been introduced to prevent cross-site-scripting XSSexecution of malicious content and code, or clickjacking within the context on a website. Those aforementioned restrictions are implemented by headers that are sent with the server response.

Content Security Policy is standardized by the W3C. CSP helps mitigating possible attacks and various cross-site-scripting vulnerabilities. Nevertheless, you must secure your application against such attacks on multiple levels as you cannot rely only on it.

The following list describes common scenarios for CSP:. Finally, we advise to read the MDN Content Security Policy documentation to get detailed explanations for possible configurations.

We recommend to use a whitelisting approach and to use a very strict policy that replaces the default one.

webpack content security policy

Consequently, you must define a list of allowed origins for all types of content and resources that are used by your website. Although, it might be feasible to start with a blacklisting approach to avoid breaking your website.

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During the creation of an application in the MindSphere Developer Cockpit a default header for the Content Security Policy is set with the following value:. The usage of the JavaScript eval is not recommended as it executes passed code with the privileges of the caller and has bad performance.

Under certain conditions a malicious party might end up running code on the user's machine which can lead to attacks. Modern JavaScript engines also support the creation of Function objects that do not suffer from security and performance problems. Nevertheless, popular frameworks like angular or vue. So called sourcemaps are emitted that contain a mapping between the transpiled and original code to allow debugging of the web application.

While this is fine for local development, it poses a problem in production environments as outlined in the previous section. The current default policy forces you to choose a different style of source mapping to avoid any problems on the MindSphere platform.

You can find alternatives in the official webpack documentation for the devtool configuration. Frameworks like angular also expose configuration parameters for those source mapping styles as well. Ask the community. Except where otherwise noted, content on this site is licensed under the MindSphere Development License Agreement. On this Page Overview Why should you use it? Why should you use it? The following list describes common scenarios for CSP: Prevent direct dynamic code evaluation by disabling eval.

Under certain circumstances eval can be also useful, but we always recommend to use Function objects to create dynamically executed code see also OWASP Article. Restrict browsers to only load resources from trusted origins and prevent, for example the web page of being embedded into iframes or completely preventing iframes. During the creation of an application in the MindSphere Developer Cockpit a default header for the Content Security Policy is set with the following value: 1.

Content Security Policy Reference

Content-Security-Policy : default-src 'self' static. By default for every directive if not overridden we only allow loading content from the own origin or static files from. We recommend to use a more strict configuration.

Allows to load style sheets from all origins and inline style attributes. We recommend to restrict those settings.The nastiest attack is probably cross-site scripting XSSwhich is when a hacker puts malicious JavaScript onto your page.

If I can run JavaScript on your page, I can do a lot of bad things, from stealing authentication cookies to logging every user action. For example, if I could put a tiny, transparent 1x1 image on your site, I could get a pretty good idea of how much traffic your site gets.

How can it tell the difference between a legitimate JavaScript file and a malicious one? Most modern browsers support a header called Content-Security-Policywhich is effectively a whitelist of things that are allowed to be on your page. You could set a header that looks like this:. You could set a CSP that looks like this:.

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The user will be able to load CSS from there, but nothing else. Refer to the stuff below for more information. All of your CSP directives like default-srcstyle-src are placed under the directives option.

Directives can be kebab-cased like script-src or camel-cased like scriptSrc ; they are equivalent. The fix is to put your CSP report route above csurf middleware. This instructs browsers to report violations to the reportUri if specified but it will not block any resources from loading. You may also set this to a function to decide dynamically whether to use reportOnly mode. You could use this for a dynamic kill switch. This function will be called with the request and response objects and must return a boolean.

By default, this module will look at the incoming User-Agent header and send different headers depending on the detected browser. If no browser is detected, this module will set all the headers with the 2.

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To disable this browser sniffing and assume a modern browser, set the browserSniff option to false. To set all headers, including legacy ones, set the setAllHeaders option to true. Note that this will change the value of the headers based on User-Agent.

You can disable this by using the browserSniff: false option above. Old Android browsers can be very buggy. This is false by default. Make sure to eschew a CDN when using this module or set the browserSniff option to false. The attack Hackers can do lots of bad things if they can put things onto your webpages. You could set a header that looks like this: Content-Security-Policy: default-src 'self'. Content-Security-Policy: default-src 'self'; style-src 'self' maxcdn.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Can your explain case why your use eval? This is very clear when you check what it CSP and how attackers can leverage eval function used in script-loader to break security. My use case is just the plain usage of this script-loader. I am going to close it but this was a big warning. I have the same issue. I try to create an application using angular 2 and bootstrap. Angular is using webpack for its build. When script loader try to load the first javascript file I get this error:.

I'm not sure I understand the work around. According to security guidelines I cannot use CSP with 'unsafe-eval' Does this mean I cannot use angular with additional scripts due to this script-loader issue?

I am not sure hotrushi don't use this anymore, i cut it off long time ago. I have a legacy minified.

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I've tried using the noParse option in Webpack but that breaks the legacy file for some reason. Skip to content. This repository has been archived by the owner. It is now read-only. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. CSP does not allow eval Labels flag: Has pull request severity: 4 inconvenient type: Bug.

Copy link Quote reply. Can we use another way other than calling eval? This comment has been minimized. Sign in to view. When script loader try to load the first javascript file I get this error: Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self'". Closes 39 Closes Remove remaining CSP issues Drop script-loader because it uses eval but CSP doesn't allow eval [W… ….Content-Security-Policy is the name of a HTTP response header that modern browsers use to enhance the security of the document or web page.

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Although it is primarily used as a HTTP response header, you can also apply it via a meta tag. The Content-Security-Policy header value is made up of one or more directives defined belowmultiple directives are separated with a semicolon.

Not all directives fallback to default-src. See the Source List Reference for possible values. If not allowed the browser emulates a HTTP status code. Defines valid sources for loading frames.

BSidesSF 2018 - No More XSS: Deploying CSP with nonces and strict-dynamic (Devin Lundberg)

In CSP Level 2 frame-src was deprecated in favor of the child-src directive. CSP Level 3, has undeprecated frame-src and it will continue to defer to child-src if not present.

Enables a sandbox for the requested resource similar to the iframe sandbox attribute. The sandbox applies a same origin policy, prevents popups, plugins and script execution is blocked. You can keep the sandbox value empty to keep all restrictions in place, or add values: allow-forms allow-same-origin allow-scripts allow-popupsallow-modalsallow-orientation-lockallow-pointer-lockallow-presentationallow-popups-to-escape-sandboxand allow-top-navigation.

This directive is deprecated in CSP Level 3 in favor of the report-to directive.

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See the Reporting API for more info. Restricts the URLs that the document may navigate to by any means. For example when a link is clicked, a form is submitted, or window.

If form-action is present then this directive is ignored for form submissions. Implementation Status. All of the directives that end with -src support similar values known as a source list. Multiple source list values can be space separated with the exception of 'none' which should be the only value.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. In order to be able to migrate from Bootstrap v3 to Bootstrap v4 one would have to weaken the Content-Security-Policy protection.

Hmm, interesting—hadn't considered this at all with the embedded SVGs. I suppose the easiest path forward for this is documenting a way to swag our navbar toggler for a custom one. I think it's better to inline them on project bundling via Grunt or Webpack if you really want less http requests but bigger CSS bundle.

webpack content security policy

When using the snippets on the getbootstrap intro page I get a content security policy error. There error in Firefox includes a line number, unfortunately Chrome does not. A CSP report is being sent.

When look the html source in firefox I can see the new meta tag added that raises the issue Moving over to the right a bit I can see that is an inline injection from bootstrap. XhmikosR : What do you mean? That you don't have inline scripting disabled?

It seems there are no content security policies defined getBootstrap csp headers. You do realize that I'm referring to the snippets that others use to work with the bootstrap library. XhmikosR Thanks for you help. Your clarification got to make a separate minimal example. It turns out that asp. It's part of the failover infrastructure to check if the script was correctly loaded and if not download the script from a secondary source.

Also yahesh I bumped into this issue as well. It turns out if you use specify the data: schema in your policy it will stop complaining Note the data: in the img-src below. The content security policy works with the code snippets defined on getbootstrap intro.

This issue is here because you would have to do that to be able to migrate from bootstrap v3 to bootstrap v4. That's exactly the regression this very issue is about - as can be seen in the second sentence of the issue text which reads "In order to be able to migrate from Bootstrap v3 to Bootstrap v4 one would have to weaken the Content-Security-Policy protection.

This is insecure; an attacker can also inject arbitrary data: URIs.