Use the dashboard

Create and deploy custom rulesets in Account Home > WAF > Custom rulesets.

Note

Account-level WAF configuration requires an Enterprise plan with a paid add-on.

Create and deploy a custom ruleset

1. Log in to the Cloudflare dashboard ↗ and select your account.

2. Go to Account Home > WAF > Custom rulesets.

   

3. To create a new empty ruleset, select Create ruleset. To duplicate an existing ruleset, select the three dots next to it > Duplicate.

4. In the page that displays, enter a name and (optionally) a description for the custom ruleset.

5. Under Scope, define when the custom ruleset should run.

   • Select All incoming requests to apply the custom ruleset to all incoming requests for all your zones on an Enterprise plan.
   • Select Custom filter expression to define a custom expression that defines when to execute the custom ruleset. Use the Field drop-down list to choose an HTTP property. For each request, the value of the property you choose for Field is compared to the value you specify for Value using the operator selected in Operator. Alternatively, select Edit expression to define your expression using the Expression Editor.

   Caution

   Deployed custom rulesets will only apply to incoming traffic of Enterprise domains. The Expression Builder will automatically include this filter. If you define a custom expression for the ruleset using the Expression Editor, you must use parentheses to enclose any custom conditions and end your expression with and cf.zone.plan eq "ENT" so that the rule only applies to domains on an Enterprise plan.

6. To create a new rule, select Add rule.

7. Enter a descriptive name for the rule in Rule name.

8. Under When incoming requests match, use the Field drop-down list to choose an HTTP property. For each request, the value of the property you choose for Field is compared to the value you specify for Value using the operator selected in Operator. Alternatively, select Edit expression to define your expression using the Expression Editor.

9. Select the rule action from the Choose action drop-down list. For example, selecting Block tells Cloudflare to refuse requests that match the conditions you specified.

10. (Optional) If you selected the Block action, you can configure a custom response.

11. Select Deploy.

12. Add other rules to the custom ruleset, if needed. You can also duplicate an existing rule in the custom ruleset.

13. Select Create.

Configure a custom response for blocked requests

When you select the Block action in a rule you can optionally define a custom response.

The custom response has three settings:

• With response type: Choose a content type or the default WAF block response from the list. The available custom response types are the following:

  Dashboard value	API value
  Custom HTML	"text/html"
  Custom Text	"text/plain"
  Custom JSON	"application/json"
  Custom XML	"text/xml"

• With response code: Choose an HTTP status code for the response, in the range 400-499. The default response code is 403.

• Response body: The body of the response. Configure a valid body according to the response type you selected. The maximum field size is 2 KB.