Hopefully this makes my question clearer. And if so how is the CSP added in code?Īm I correct in assuming that the script tags can just have the nonce added via #PUG TEMPLATE + ADDING NONCE VALUE TO ATTRIBUTE CODE#Which event in global.asax should the nonce be generated.Ĭan the CSP in web.config be overridden to add the generated nonce value, or does the CSP have to be generated in the code directly and thus make it non-configurable. Thanks for replying, but you've not answered any of the questions I've asked. You can also use tools such as openssl to generate it, whitespace is not ignored." The easiest way to generate it is to just open the developer tools console and it will output what the expected hash of your script was in the console error message. The CSP Level 2 specification allows sha256, sha384, and Script-src directive to allow it to execute via our Content-Security-Policy header: script-src 'sha256-RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc=' What CSP hash algorithms are supported? If you compute the SHA-256 hash of our entire JavaScript code block, in our case it is just:ĭoSomething() you will get the value: RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc= Suppose we have the following script on our page: doSomething() Here's how one might use it with the CSP with JavaScript: Using a hash is one way to allow the execution of inline scripts in a Content Security Policy (CSP). The nonce's value is available to script via the nonce IDL attribute, and so can be propagated just as today. From then on, the slot's value and the content attribute's value are disconnected alterations to one have no effect on the other, and vice-versa. If you need to allow inline scripts, perhaps you should use the hash implementation rather than the nonce implementation, since The content attribute's value is set to the empty string. #PUG TEMPLATE + ADDING NONCE VALUE TO ATTRIBUTE GENERATOR#Given the requirement for a random token generator for each request, nonce seems to be anything but a simple implementation. The random nonce value should only be used for a single HTTP request." You should use a cryptographically secure random token generator to generate a nonce value. Script-src directive: script-src We are using the phrase: to denote a random value. Using a nonce is one of the easiest ways to allow the execution of inline scripts in a Content Security Policy (CSP). Nonce is a randomly generated token that should be used only one time.", so hard coding it anywhere is not going to meet the requirements.įurther, the example given is: "Example Nonce Usage The subject is much more complicated than you may think.
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