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Manage Content Security Policy (CSP)

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This article describes how to manage Content Security Policy (CSP) in Microsoft Dynamics 365 Commerce.

CSP is an additional layer of security that helps detect and mitigate some types of web attacks. The purpose of these attacks can range from data theft, to site defacement, to the distribution of malware. CSP provides an extensive set of policy directives that help you control the resources that a site page is allowed to load. Each directive defines the restrictions for a specific type of resource.

When CSP is turned on for an e-Commerce site, it helps enhance security by blocking connections, scripts, fonts, and other types of resources that originate from unknown or malicious sources. In Dynamics 365 Commerce, CSP is turned on by default. However, it will likely require additional configuration for most sites. The Dynamics 365 Commerce online software development kit (SDK) provides a default list of allowed source URLs that style, script, and application programming interface (API) calls can be made from. You can edit this list on the Extensions tab in the site builder tool.

For more information about CSP, see Content Security Policy Reference.

CSP settings

Turn off CSP for a site

To prevent CSP from applying policies to your site, you can turn it off for that site in site builder.

To turn off CSP for a site, follow these steps.

  1. In site builder, select the site you are working on.

  2. Select Site settings, and then select the Extensions tab.

  3. On the Content security policy tab, select the Disable content security policy check box.

    Disable content security check box on the Content Security Policy tab.

  4. Select Save and publish.

Enable report only mode

If CSP is enabled, content security policy will not be enforced, but any violations will be reported to URIs specified by the report-uri directive.

To enable report only mode, follow these steps.

  1. In site builder, select the site you are working on.
  2. Select Site settings, and then select the Extensions tab.
  3. On the Content security policy tab, select the Enable report only mode check box.

Enable nonce

Enabling nonce (number used once) will block the execution of all inline scripts except those specified within the inline script module. A unique cryptographic nonce is generated and added to each script specified in the CSP header.

To enable nonce, follow these steps.

  1. In site builder, select the site you are working on.
  2. Select Site settings, and then select the Extensions tab.
  3. On the Content security policy tab, select the Enable Nonce check box.

CSP directives in Commerce

The following CSP directives can be used on Commerce sites.

Directive Description
child-src This directive defines valid sources of web workers and nested browsing contexts that are loaded by using elements such as <frame> and <iframe>.
connect-src This directive defines the URLs that AJAX requests can be made from.
font-src This directive defines valid sources of fonts.
frame-ancestors This directive specifies valid parents that may embed a page using <frame>, <iframe>, <object>, <embed>, or <applet> elements. Setting this directive to "none" is similar to specifying the "X-Frame-Options: DENY" directive (which is also supported in older browsers).
frame-src This directive defines valid sources for nested browsing context loading using elements such as <frame> and <iframe>.
img-src This directive defines valid sources of images.
media-src This directive defines valid sources of audio and video, such as HTML5 <audio> and <video> elements.
object-src This directive defines valid sources of plug-ins, such as <object>, <embed>, and <applet> elements.
report-uri This directive defines URI(s) that the browser will post CSP violation reports to. These violation reports consist of JSON documents sent via an HTTP POST request to the specified URI.
script-src This directive defines valid sources of JavaScript.
style-src This directive defines valid sources of stylesheets.

Example: Configure a CSP directive

The following example procedure shows how to configure a CSP directive so that an external script can be called from your site.

  1. In site builder, select the site you are working on.

  2. Select Site settings, and then select the Extensions tab.

  3. On the Content security policy tab, under script-src, select Add, and then enter the full URL of the external script that should be called.

    URL for an external script on the Content Security Policy tab.

  4. Select Save and publish.

Interpret and fix CSP errors

When you first configure CSP for a site, some pages probably won't be loaded at all or won't work as intended, because CSP is blocking external connections, scripts, fonts, and other types of resources from being loaded. Fortunately, CSP logs some helpful errors that you can use to fix, tune, and clean up unwanted or unneeded requests.

The following illustration shows an example of CSP errors in a web browser's developer tools.

CSP errors in a web browser's developer tools.

There are two CSP errors in this example:

  • The Eval function is blocked by default, because it can cause arbitrary JavaScript execution. To allow this function, add 'unsafe-eval' to your site's script-src directive. The single quotation marks are required.
  • The external stylesheet is blocked. To allow a stylesheet to be loaded from an external domain, add the URL to your site's style-src directive.

The following screenshot shows what the fixed settings look like on the Content Security Policy tab in Commerce.

Fixed settings on the Content Security Policy tab.

Update page mocks that use CSP

If you're testing modules by using the online SDK in a development environment, you can also add CSP by using page mocks. In a page mock, you must either add a top-level "appContext" property or go to the existing top-level "appContext" property, and create a property under it that is named "contentSecurityPolicy". There, you can add key/value pairs of directives to policies, as shown in the following example.

"appContext": {
	"contentSecurityPolicy": {
		"script-src": ["https://www.w3schools.com/js/myScript.js"],
		"font-src": ["https://*.commerce.dynamics.com"]
	}
}

Note

If you add CSP policies in a page mock, the page mock won't include any of the default CSP policies that are provided by the platform.

You can turn off CSP in a page mock by using the following code.

"appContext": {
	"contentSecurityPolicy": {
		"disableContentSecurityPolicy": true
	}
}

Additional resources

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