Edit

Configure security headers with Azure Front Door Standard/Premium Rule Set

  • Article

This article shows how to implement security headers to prevent browser-based vulnerabilities like HTTP Strict-Transport-Security (HSTS), X-XSS-Protection, Content-Security-Policy, or X-Frame-Options. Security-based attributes can also be defined with cookies.

The following example shows you how to add a Content-Security-Policy header to all incoming requests that matches the path in the Route. Here, we only allow scripts from our trusted site, https://apiphany.portal.azure-api.net to run on our application.

Prerequisites

Add a Content-Security-Policy header in Azure portal

  1. Go to the Azure Front Door Standard/Premium profile and select Rule Set under Settings.

  2. Select Add to add a new rule set. Give the Rule Set a Name and then provide a Name for the rule. Select Add an Action and then select Response Header.

  3. Set the operator to Append to add this header as a response to all of the incoming requests for this route.

  4. Add the header name: Content-Security-Policy and define the values this header should accept. In this scenario, we choose "script-src 'self' https://apiphany.portal.azure-api.net".

  5. Once you've added all of the rules you'd like to your configuration, don't forget to associate the rule set with a route. This step is required to allow the rule set to take action.

Note

In this scenario, we did not add match conditions to the rule. All incoming requests that match the path defined in the associated route will have this rule applied. If you would like it to only apply to a subset of those requests, be sure to add your specific match conditions to this rule.

Clean up resources

Deleting a Rule

In the preceding steps, you configured Content-Security-Policy header with Rule set. If you no longer want a rule, you can select the Rule Set name and then select Delete rule.

Deleting a Rule Set

If you want to delete a Rule Set, make sure you disassociate it from all routes before deleting. For detailed guidance on deleting a rule set, refer to Configure your rule set.

Next steps

To learn how to configure a Web Application Firewall for your Front Door, see Web Application Firewall and Front Door.