Angular 15 csp nonce

Angular 15 csp nonce. I am a freelance and working on frontend application where we have content security policy is applied on our application which is developed in angular 16. Our detailed blog will examine CSP, Nonce's importance, and how to seamlessly apply them in Angular apps. May 29, 2023 · Which @angular/* package(s) are the source of the bug? core Is this a regression? Yes Description Below code throws Error: Module '"@angular/core"' has no exported member 'CSP_NONCE'. 0. That is to say, Content-Security-Policy is the key while the actual policy is the value. Jul 19, 2022 · or use a nonce/hash, like this: Content-Security-Policy: style-src 'nonce-0123456789' When using a nonce, you have to reference it in the <style> tag: <style nonce="0123456789"> body { background: red; } </style> This approach requires you to generate a new nonce on every page load and might be harder to implement. Mar 6, 2024 · CSP nonce not working in dot net angular application. Aug 3, 2016 · Step to reproduce with Angular CLI. May 3, 2023 · In Angular v16, we’ve implemented a new feature spanning the framework, Universal, CDK, Material, and the CLI which allows you to specify a nonce attribute for the styles of the components that Angular inlines. For example - nuxt. Sep 26, 2018 · Versions. Unless you only have a few attributes with static content that need hashes you should still try to move it. Add the generated CSP in the HTML Head and add meta tags. js script. 1. The GetNonce method reads the nonce value from the BlazorNonceService service. We build our CSP from an object in the Worker and inject the nonce. The purpose of this PW is to implement a CSP based on a dynamic nonce. 2019 at 15: CSP Hash Example. Mar 31, 2020 · The right answer is - no were. It functions by defining and detailing paths and sources from which resources can be securely loaded by the browser. js: Apr 11, 2022 · Overview of CSP for SPAs. Unfortunately, I'm not sure how to get that value, generated at run-time on the client, to the actual CSP policy, which is either set as a meta-tag in the index. Styled components currently forcing unsafe-inline styles in CSP gruelbox/orko#57. The precise method for detecting replay attacks is Client specific. Mar 19, 2020 · The option name is perhaps a bit misleading here and we could probably improve our docs around it. The nonce to be added as an attribute to the theme style tags. Jun 6, 2022 · The HTML nonce attribute is a global content attribute that defines a cryptographic nonce(” number used once “). How can I add nonce through webpack? Following are my application configurations. I’ll explain how to use nonce with spring security, if you are using . In the policy key of the csp config file is set to \Spatie\Csp\Policies\Basic::class by default. We need the whole output. There are two ways to specify the nonce: using the ngCspNonce attribute or through the CSP_NONCE injection token. Mar 12, 2021 · If a nonce value was sent in the Authentication Request, a nonce Claim MUST be present and its value checked to verify that it is the same value as the one that was sent in the Authentication Request. cs file. May 6, 2023 · Other changes in Angular 16. Response. like <style nonce="##CSP_NONCE##"> and <script nonce="##CSP_NONCE##"> The placeholder ##CSP_NONCE## then gets replaced with the nonce in my express route, by TESTNONCE123abc. The nonce attribute lets you “whitelist” certain inline script and style elements, while avoiding use of the CSP unsafe-inline directive (which would allow all inline script and style ), so you still retain the key CSP feature of disallowing inline script / style in general. 8 and the new application created with the instructions below. Hay dos formas de especificar el nonce: usando el atributo ngCspNonce o mediante el token de inyección CSP_NONCE. In a nutshell, deploying modern CSP policies with SPAs is perfectly feasible, albeit with a bit more effort than you would expect. This includes not only URLs loaded directly into <script> elements, but also things like inline script event handlers ( onclick) and XSLT stylesheets which can trigger script execution. This placeholder can be used in the output of your application, and as long it goes through Nginx, it will be replaced with a fresh and unique nonce: <script nonce="NGINX_CSP_NONCE"> /** * Your inline script */ </script> #Sending the nonce with the CSP headers. UUIDv4 is longer (less compact) and has less random bits, but it's easier to read when you are Feb 6, 2020 · Inserting nonce tags and especially matching them up in CSP is often tricky. 1 - Implement a CSP based on a nonce, server-side: Implement a CSPResource REST api Mar 5, 2024 · We've recently released some new passive scan checks for CSP issues in Burp. So first, you define a CSP nonce Mar 13, 2017 · You will call this method on your Views, where are your inline scripts. 2. The library first loads the script into the head section, and this creates tags, which are blocked by the CSP setting. But it's hard to manage CSP with a lot of hashes when you change code and need to replace some hashes by a new ones. What is the motivation / use case for changing the behavior? So that I can comply with business requirements not to use 'unsafe-inline' in CSP. I am implementing CSP for an Angular + ASP project. The recommended method is to use a nonce, which should be an unguessable Note: This directive is only available in the ng-csp and data-ng-csp attribute form. Learn from the answers and comments of other developers who faced similar issues. 1 OS: linux x64 Angular: 5. Expected behavior. Content Security Policy Cheat Sheet¶ Introduction¶. Was able to construct the below policy and could see the response headers holds correct nonce- value. As a workaround, the following script exhibits the same behavior and timing as an script with async/defer and an onload handler, while satisfying the specified CSP policy: CSP_NONCE. Code:. It is used by Content Security Policy(it is an additional layer of security that helps to detect and mitigate certain types of attacks like data injection attacks) to check whether a given fetch will be allowed to proceed for a given element or not. If you compute the SHA-256 hash of our entire JavaScript code block, in our case it is Now I have to build the project for a new customer that have very strict CSP, that is just. Create a function to accomplish to create a nonce and generate CSP and return the CSP string along with the nonce. Apr 7, 2018 · I want add nonce in the style and script src to work with strict CSP. Feb 19, 2024 · Using the nonce in the UI. Step 1: Decide if you need a nonce- or hash-based CSP. – Matthieu Riegler. Learn more about Teams Mar 15, 2021 · Adopting a strict CSP. CSP explicitly doesn't allow this; that's not a bug -- it's the entire point. I am able to serve the application ng serve and adding the header to both the <app-root and CSP header works correctly, but with the ngCspNonce value set, I am unable to build using ng build. The strict-dynamic source expression specifies that the trust explicitly given to a script present in the markup, by accompanying it with a nonce or a hash, shall be propagated to all the scripts loaded by that root script. Jan 17, 2021 · Suggestion for solving the problem A nonce would (if static) solve my use case. Apr 16, 2021 · You have to use strict-dynamic CSP source instead of nonce if you want to dynamically import/construct scripts. Dec 3, 2021 · Content Security Policy is sent to the browser using a Content-Security-Policy HTTP header. The following code shows the format of the Content Security Policy: Content-Security-Policy: policy. Following the Angular security guide I'm attempting to use CSP in my Angular application but I'm having difficulties with two parts. pgsandstrom mentioned this issue on Jan 31, 2019. 0c05c6d4245461043e3f. For example by defining the nonce in the nuxt. html file (or some equivalent) or on the server itself. The static app files are served with a Content-Security-Policy header containing a nonce. CSP spec requшres that server MUST generate a fresh value for the 'nonce-value' at random and independently each time it transmits a policy (each page loading). Sep 28, 2023 · All styles and scripts loaded by Angular have the nonce attribute. Here's how one might use it with the CSP with JavaScript: Suppose we have the following script on our page: <script>doSomething();</script>. Jul 15, 2020 at 15:05 Yes they are supported but you have to work in a slightly different way to get them working. Oct 19, 2023 · The HTTP Content-Security-Policy (CSP) script-src directive specifies valid sources for JavaScript. So far I implemented with a static nonce (which obviously is not good practice): Added script-src 'strict-dynamic' 'nonce-RandomNumber' to my csp policy inside startup. The options are as follows: no-inline-style: this stops AngularJS from injecting CSS styles into the DOM Jan 5, 2024 · when building the frontend, you see that placeholder nonce is used for the inline styles & scripts. Jan 5, 2023 · The default Content Security Policy (CSP) used by Keycloak is not locked down enough, and should be improved as it adds a lot of additional protection against XSS attacks. Headers. At least in CSP level 2 this would mostly be restricted to <script> and <style>. The nonce is applied to all script tags. I suppose you could set the CSP meta-tag dynamically on the client, but that seems like a security risk. 0 npm: 6. Only <script> and <style> are nonceable elements. ng new csp-test Insert in the index. earlier we have applied Unsafe-evel and Unsafe-inline to allow inline scripts and contents but now we need to apply nOnce in which we Jul 21, 2021 · I have a Single Page Application written in Angular using a Workbox powered service worker. If not provided, Angular will look up its value from the ngCspNonce attribute of the application root node. Setting a value allows the use of CSP policy without using the unsafe-inline directive. When using a nonce, the overall security can be increased and it is harder to do XSS attacks or other type of attacks in the web UI. 0, followed the pr(#49444) to enable the CSP_NONCE token, and replaced the 'unsafe-in Jun 26, 2023 · I created a new project using angular cli 16. May 13, 2017 · If malicious actors can guess the CSP nonce (which they can if you use Unique ID) then there is absolutely no point in using the CSP. By combining CSP with Nonce, Angular apps can enhance their security. 1. I get the following error: Nov 1, 2023 · Teams. Many other changes are not detailed here: Improvements for IDE (Language Service in VS code, autocomplete import in templates) New server engine for development Vite (in preview, needs to be enabled). Our assumption is there are dynamic inline scripts generated for kendo controls which not contains nonce. This class allows your site to only use images, scripts, form actions of your own site. Open. So the nonce attribute is a way to tell browsers the inline Mar 18, 2022 · Do you want to learn how to create a robust Content Security Policy that can prevent XSS attacks and enhance your web security? In this article, you will find a detailed guide on how to implement a nonce based CSP3 policy with Webpack and Nginx. Sorted by: 7. CSP is useless for files with text/css and text/javasctirt MIME-types (only Firefox non-standardly supports CSP for script files used for Workers). Viewed 5k times. There is an issue in the FW repo about using a nonce for inline styles, this is probably the feature you're looking for: angular/angular#26152 May 30, 2023 · The simplest way to set up a Content Security Policy is through a header sent by the web server. 1 – Alessandro Ricci. Like I said in the previous answer you have to import all the styles in a single css file and remove all the <script> tags. Jan 21, 2021 · If you have a CSP with a nonce and there's a regular HTML injection in your application, the CSP will generally prevent script execution; if there's an injection into the URL of a <script src> or into the body of an inline <script> element with the correct nonce, the CSP will not protect you and the attacker will be able to execute arbitrary Jun 27, 2021 · So, I figured that if it used to work in Angular 11, it should be possible to get it to work in Angular 12. The problem is that you have the style in an attribute, try moving to a style block or css file. Jan 6, 2021 · The alternative presented on that page is to use hash or nonce. Saved searches Use saved searches to filter your results more quickly Oct 18, 2019 · I will answer question that I've given the bounty. cs code behind the file, and update the OnGet () method: public void OnGet() {. These changes add a new `CSP_NONCE` injection token that will allow users to provide a nonce, if their app is using CSP. This code is built as inline JavaScript code that injects the gtm. Add("Content-Security-Policy", "default-src 'self';"); } This is the basic setup of a CSP. Connect and share knowledge within a single location that is structured and easy to search. html. Jan 18, 2021 · The nonce keyword is a powerful mechanism to whitelist inline scripts and styles. This is how the class looks: namespace App \ Support ; use Spatie \ Csp \ Directive ; use Spatie \ Csp \ Value ; class Basic extends Policy. 2. 0, which is showing the problem. For CSP to be more effective any inline style or script has to be externalised. The CSP_NONCE InjectionToken was added in Angular Content Security Policies. contentSecurityPolicy (policy). Static app files (such as index. No ability to define nonce attribute on style tag. html) which contain <script> tags are decorated with a nonce attribute (<script nonce="FCNjs05n4eQdfn39fn3c9h5segb">). How to deploy a CSP based on script nonces or hashes as a defense-in-depth against cross-site scripting. It can help you to avoid using the CSP unsafe-inline directive, which would allowlist all inline scripts or styles. Feb 22, 2021 · Nonce can be used in nonceable elements. A unique hash-based nonce will then be generated and provided for each unique page view (this is why __webpack_nonce__ is specified in the entry file and Sep 8, 2023 · Content Security Policy (CSP) stands as a potent defense, countering attacks like XSS, data injection, and code injection. What you're trying to do is add another nonce, via Ajax, after the initial page load. Webpack is capable of adding a nonce to all scripts that it loads. You will also learn about the benefits and challenges of this approach, and how to test and debug your policy. This article brings forth a way to integrate the defense in depth concept to the client-side of web applications. CSP header is an instruction for the browser what resources and where it can take. I would like the ability to define a nonce generated on the server that angular will add to the inline styles so that I can comply with business requirements not to use 'unsafe-inline' in CSP. May 17, 2021 · How to use Angular 12 CSS optimization feature without violating Content Security Policy for inline event handlers? This post discusses the possible solutions and challenges of this issue, and invites other Angular developers to share their insights and experiences. The CSP will be generated server-side but loaded client-side. script-src. json. Content Security Policy (CSP) is recognized as a browser technology, primarily aimed at shielding against attacks such as cross-site scripting (XSS). Feb 24, 2023 · The nonce attribute is useful to allowlist specific elements, such as a particular inline script or style elements. <script nonce-123abc> and call another helper which is explained on the following step. Regardless, the option doesn't help with CSP and isn't what you're looking for here. Then we will add inline scripting and secure it with a nonce. Directive type. randomBytes (16) and encode it in either base64url (22 characters), base64 (24 characters), or hex (32 characters), all of those are shorter that UUIDv4 which is 36 characters. Apr 8, 2021 · Edit 2024-02-01: In CSP level 3, which has good browser support now, you can use 'unsafe-hashes' in addition to the hash of the attribute code to allow attribute styles/scripts. Aug 14, 2023 · Which @angular/* package(s) are the source of the bug? platform-browser Is this a regression? No Description I have updated my angular project to V16. For example. In this case, it will accept scripts with a nonce of random123 (second policy) which are either inline <script> blocks or come from {foo Jan 16, 2017 · In short, CSP gives us a way to control the content that can be loaded into our pages by the browser and one of the common problems is removing inline scripts and styles. In this article, we covered two scenarios: isolated applications and more complex applications with dynamic code loading. 1 to test the new CSP styling nonce injection feature. Closed. To use CSP with Material UI (and Emotion), you need to use a nonce. By including the nonce in the webpack rebuild, I would be able to refer to the static nonce in the CSP header fields because the value would not change. I have implemented CSP (Content Security Policy) with nonce approach using this link- https://dev. config. Jan 8, 2016 · One way to allow the styles to be applied is to set a `nonce` attribute on them, but because the code for inserting the stylesheets is deep inside the framework, users weren't able to provide it without accessing private APIs. Learn more about Teams Jan 29, 2024 · To use Google Tag Manager on a page with a CSP, the CSP must allow for the execution of your Tag Manager container code. I’ve talked earlier about the complexities of web security, about how hard it is to balance security and functionality. jsLibrary({ nonce: '<XXXX>' }); <style nonce="<XXXX>"> </style> Mar 18, 2021 · Check the Content-Type header of vulnerabled URls. A nonce is a randomly generated string that is only used once, therefore you need to add server middleware to generate one on each request. 0 ng: 6. May 5, 2023 · En Angular v16, se inplemento una nueva función que abarca el framework, Universal, CDK, Material y la CLI que te permite especificar un atributo nonce para los estilos de los componentes que Angular inserta. Environment May 23, 2023 · Tried to setup CSP nonce in angular application hosted on apache httpd server using mod_cspnonce module. The idea is that a web application or web server declares the Content Security Policy that whitelists one particular pseudo-random value - the nonce: Per its name, the value should be used once, so should be unique at least per user session. Using a hash is one way to allow the execution of inline scripts in a Content Security Policy (CSP). # CSP evolution to strict CSP. Sep 12, 2019 · Now that we've set the nonce on all of our scripts tags, we will build a response as normal and send it back to the Worker. Since we have to run dynamic js files, I am trying to implement script-src with "strict-dynamic". A CSP nonce is a Base 64 encoded string. We recap our recommendations for both scenarios below. I thought nonce attribute on scripts would allow evals, but according to my recent research, it only allows unsafe-inline - not unsafe-eval. By using CSP, developers can specify which origins are permissible for content sources, scripts, stylesheets, images, fonts, objects, media (audio Jan 14, 2020 · 1 Answer. I would like the ability to define a nonce generated on the server that angular will add to the inline styles. The Client SHOULD check the nonce value for replay attacks. Therefore, in the case of server-side rendering, the 'nonce value' is more often used. Sep 23, 2023 · To use the CSP Improvements in Angular 16, you need to import the csp() function from the @angular/core package. Step 2: Set a strict CSP and prepare your scripts. Then append the script tag to the body of the iframe's content document. I think that the only way to make library work with CSP is to add nonce option to CSP. Simple example: Content-Security-Policy: default-src https: When the browser will see this directive it will refuse to load anything from HTTP. NET Framework 4. Set the nonce (to a unique value) on each page load, and use this to indicate what scripts your page has requested. js application against various security threats such as cross-site scripting (XSS), clickjacking, and other code injection attacks. Is there any way to fix it without using 'unsafe-eval'? . Oct 24, 2023 at 15:12. Step 3: Refactor HTML templates and client-side code to remove patterns incompatible with CSP. Note: Only use nonce for cases where you have no way around using unsafe inline script or style contents. You can generate one like this: import uuidv4 from 'uuid/v4'; const nonce = new Buffer(uuidv4 Jun 13, 2018 · New to Content Security Policy stuff so not sure if this is possible or not, but wondering how to add a hash or nonce for some inline script within a HTML element's attribute. Now let's take a look at the format of a policy. Dec 18, 2023 · One of the libraries I am using (json-logic-engine) is using eval function, that's why I can't make it run without 'unsafe-eval'. js file. May 31, 2019 · If there is a way to use nonce on an inline handler, I will accept an answer that demonstrates it. Take responsibility and take a final decision which scanner warnings should be fixed and which - ignored. I searched for previous answers but only came with the fact of moving my components styles from stylesUrls to the styles property in the angular. Nov 6, 2023 · This article shows how to use a strong nonce based CSP with Angular for scripts and styles. so it may cause an issue. 3 os: Windows 10. A separate solution is required for development and production deployments. bundle) are being blo Jan 3, 2021 · Generate a nonce using uuid v4 and convert it to base64 using crypto nodejs module. Aug 19, 2020 · The Angular docs mention CSP, and Google's Security Engineers recommend against using whitelists. I noticed that when an external library adds something to the head section of the page the nonce is not set. There are several ways to do this, such as the use of a nonce or a hash. To do that the library will need to change all inline style with <style> tag, with that nonce. CSP Nonce. How to implement CSP in an Angular app? CSP using HTTP header (server-side) CSP using a meta tag (client-side) Conclusion. I am developing angular web app. Angular code does no nothing (and should not know) about Content-Security-Policy header. I suppose it has to do with Webpack, but the ng eject command has been removed from the cli a while Jul 5, 2023 · Teams. headers (). Mar 5, 2020 · 342. CSP Reporting and Testing. What I haven't figured out yet is how to inject a nonce into the script tag (s) that Angular injects into the index. Content-Security-Policy: "default-src 'self';" The policy cannot be modified. Note 1. ii. These resources encompass a range of elements such as images, frames, and May 3, 2023 · For the nonce attribute you should set it on the script tag rather than the iframe. I'll go through each one so you can understand how to fix these issues if you encounter Nov 29, 2022 · 1. These checks will find issues like form hijacking, allowlisted resources, untrusted script execution, untrusted style execution, malformed syntax, clickjacking and non-enforced CSP. What I have been doing to resolve the issue (my project is reletively small with just a couple dozen of components): Copy (one by one) relative link of components, put them into angular. Now to apply the nonce applied nonce for inline script <script type="text/javascript" nonce="a9f04fd1-06cf-4948-9d66-ea306e581896"> </script> but after applying these change kendo controls not working. And add suport for CSP with nonce to the library. 3 Node: 6. Jan 21, 2024 · Here we use NGINX_CSP_NONCE as the placeholder for the nonce. html the meta tag defining the following restrictive Content Security Policy. CSP evolution with script-src directive : A nonce is a random number generated for single usage to mark a <script> tag as trusted. By injecting the Content-Security-Policy (CSP) headers from the server, the browser is aware and capable of protecting the user from dynamic calls that will load content into the page currently being visited. Let’s open the Index. html Aug 4, 2020 · Unfortunately the solution in the comments: SOLUTION - My dockerfile was upgrading the helmet to 4. Your initial CSP, loaded with the page, provides a nonce. Yes, content-security-policy is complex without the nonce. json configuration file seem to become inlined when running ng build. From the Worker, all we need to do is build the CSP header and inject it into the response headers that came from the origin. But SPA uses meta tag CSP and also SPA are not compatible with nonce . What you might do is allow a script-src of strict-dynamic. Jan 21, 2022 · CSP script nonces. We need to investigate what would be the best header. Then create Content Security Policy and add the generated nonce value. Unfortunately, at the time of writing, I don't think there is. to/ferdiesletering/how-to-implement-an-inline-styles-content-security-policy-with-angular-and-nginx-2ke2. const. As a solution, I changed the dockerfile and informed the helmet and espress versions. The MVC application creates the nonce and it is retrieved in the Angular SPA by following the workaround in this comment #6361 (comment) May 17, 2023 · 4. node: 10. eg: <script <%CreateNonce ()%> When you call this helper, it will return an output that generated nonce value, eg. html (to "bootstrap" itself). If your script code is static and does not include anything that changes it would be much easier to whitelist them based on their hash. Client-side nonce support #2363. 8 MVC application with Angular 15 embedded in it. And having a static nonce is useless. To work around Safari’s lack of support for script nonces in CSP Level 2, we serve a Content-Security-Policy header with the script-src directive that includes both a nonce and unsafe-inline. Second, any link tags that import styles also seem to be loaded and inlined by ng-build. 14. So, in my manifest I already have: "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self' I tried adding the unsafe-hashes to the angular's index. I copy one by one because the css/scss You could generate a 128-bits totally random nonce with crypto. White-list CSP properties requires a lot of customization and maintenance. Either switch to a hosting provider that actually supports security, or disable fake security. Is there any way to add the missing nonce? It is a . badgerwithagun mentioned this issue on Nov 11, 2018. If you remove 'unsafe-inline' many browsers will tell you which hashes need to be added. 8. This should improve, among other features, the hot reload and refresh (HMR) Content Security Policy (CSP) is important to guard your Next. Use the last Angular CLI with Webpack 6. You can also follow the instructions below. Jan 10, 2018 · I have created Angular 2 production build with the following command: ng build --prod --aot However the generated files under dist folder (example: main. To enable CSP, you need to configure your web application to return the Content-Security-Policy HTTP header. json, in styles attribute. and (). What is Content Security Policy (CSP)? Jun 22, 2022 · How to configure CSP in nginx using nonce approach in angular? Asked. The BlazorNonceService can be used from the Blazor components in the InteractiveServer render mode. . Jun 8, 2017 · Add support for __webpack_nonce__ to inline styles CSP angular/angular-cli#12378. The web application Content-Security-Policy: script-src 'nonce-random123' 'strict-dynamic' 'unsafe-inline' https: The browser will check each script against each policy separately and only allow those which match both policies. Q&A for work. More Angular CSP. First any styles included via the angular. Dec 16, 2019 · How to set the connect-src directive of Content Security Policy dynamically in Angular? This question on Stack Overflow explores the possible solutions and challenges of implementing a dynamic CSP in Angular applications. This is what I hope to address in the blog. The policy string is static, so you can’t generate a random nonce for each request. At first look this seems like an error, but luckily browsers that support nonces will see the nonce and ignore the unsafe-inline. Following are my application configurations: Angular CLI: 1. Token used to configure the Content Security Policy nonce that Angular will apply when inserting inline styles. 3. I have created a GitHub repository. 6. 0 Oct 28, 2021 · The 'hashe-value' uses mostly in SPA (Single Page Apps) where you have no possibility to refresh nonce value. To activate this feature, set a __webpack_nonce__ variable and include it in your entry script. Inline script like this can't be used: Practical Work Web-Application directory : pw/pw-csp-nonce. This is because Angular will bundle all styles in this attribute as a single css/scss file. Feb 7, 2021 · The answer: a nonce. You can specify which of the CSP related AngularJS features should be deactivated by providing a value for the ng-csp attribute. CSP version. The other relevant piece of configuration might be my angular Sep 6, 2021 · Of couse you can manage 'nonce-value' into CSP HTTP header using Spring Security built-in filters. Then, you can use the csp() function to create a new CSP policy. If the script does not have the correct nonce, it will not be loaded. Desired functionality. Oct 24, 2023 · Angular CLI: 15. In addition it will need to be dynamic/smart as different parts of Keycloak requires different CSP headers. zp hr br ld my ut mu hi sn ky