Configure CSP in an Ember CLI application which uses http-mock

Question

I'm using http-mock with Ember CLI as suggested on http://www.ember-cli.com/#ember-data. I understand the basic concept of CSP but I don't understand the configuration of it within an Ember CLI application.

How can I configure my application to either accept requests to localhost:4200/api/ to avoid this during development:

Content Security Policy violation: {
    "csp-report": {
        "document-uri":"http://localhost:4200/products",
        "referrer":"",
        "violated-directive":"style-src 'self'",
        "effective-directive":"style-src",
        "original-policy":"default-src 'none'; script-src 'self' 'unsafe-eval' localhost:35729 0.0.0.0:35729; font-src 'self'; connect-src 'self' ws://localhost:35729 ws://0.0.0.0:35729 http://0.0.0.0:4200/csp-report; img-src 'self'; style-src 'self'; media-src 'self'; report-uri http://0.0.0.0:4200/csp-report;",
        "blocked-uri":"",
        "source-file":"chrome-extension://alelhddbbhepgpmgidjdcjakblofbmce",
        "line-number":1,"column-number":20481,"status-code":200
    }
}

Answer 1

You can adjust your content security policy by editing config/environment.js. I believe in your case, the connect-src is relevant to the error being thrown (edit: looks like style-src is being violated, possibly by Chrome Extension Awesome Screenshot). Adding * will allow it to connect to anything.

var ENV = {

  ...

  contentSecurityPolicy: {
    'default-src': "'none'",
    'script-src': "'self'",
    'font-src': "'self'",
    'connect-src': "'self' *",
    'img-src': "'self'",
    'style-src': "'self' *",
    'media-src': "'self'"
  }
}

Or more specifically, you could add:

...
'connect-src': "'self' 'localhost:4200'",
...

Furthermore, if you only wanted to add this to your dev environment, put it in:

if (environment === 'development') {
  ENV.contentSecurityPolicy = {
    ...(policies)...
  }
}

More information available about CSP in ember-cli: https://www.npmjs.com/package/ember-cli-content-security-policy.

More information about CSP in general: http://content-security-policy.com/