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terraform-aws-waf-drop

Terraform module that keeps AWS WAF IP sets up to date with the latest IPs from Spamhaus's DROP and EDROP lists.

This module utilizes the Reputation Lists AWS WAF sample Lambda function.

Notes

At the time of this writing, Terraform doesn't support AWS WAF, so we use CloudFormation to create the WAF IPSets and Rules. Since WAF has a limit on the number of IPs that can be in an IPSet, and Rules don't support ORing predicates together, we have to create more than one IPSet and more than one Rule. There is a cost associated with creating rules.

Also, we run everything in us-east-1. PRs welcome if this is something you want to change.

Resources Created

  • CloudFormation template
  • CloudWatch Events rule
  • CloudWatch Events target
  • Lambda function
  • IAM policy
  • IAM role
  • WAF IP set
  • WAF rule

Configuration

  • name: A unique name for this instance of this module. [A-Za-z0-9-_] only please. Example: Staging-API
  • schedule (default rate(8 hours)): When to run the Lambda function

Outputs

  • waf_ipset_1_id: The ID of the IPSet we create.
  • waf_ipset_2_id: The ID of the IPSet we create.
  • waf_rule_1_id: The ID of the Rule we create.
  • waf_rule_2_id: The ID of the Rule we create.