Samples for use of AWS WAF - Web Application Firewall, including Lambda functions, and SDK usage examples.

A solution that automatically detects unwanted requests based on request rate, and then updates configurations of AWS WAF (a web application firewall that protects any application deployed on Amazon CloudFront content delivery service) to block subsequent requests from those users. This process is executed by a lambda function that processes application’s access log files in order to identify bad requesters. This function also exposes execution metrics in CloudWatch so you can monitor how many request entries were processed and the number of origins blocked. Finally, the solution also support that you manually add IP ranges that you want to block in advance like well know bot networks.

A solution for detecting bad bots and content scrapers and blocking their access. The detector relies on a honeypot URL. This is usually a piece of content that good actors know their not supposed to access, either because it's disallowed by the robots.txt file, or the link to it is hidden from human viewers. An Amazon API Gateway endpoint maps to the honeypot URL and triggers a AWS Lambda function once a request is received. The Lambda function then adds the source IP address of the request to a blacklist implemented using AWS WAF (a web application firewall that protects any application deployed on Amazon CloudFront content delivery service). The AWS Lambda function also issues an Amazon SNS notification on a topic you can subscribe to, and receive notifications anytime IPs are added to the blacklist.

A solution that automatically parses CloudFront access logs as they are delivered to Amazon S3 by using Lambda, counts the number of bad requests from unique sources (IP addresses), and updates AWS WAF to block further requests from those IP addresses. A CloudFormation template is included that creates the web access control list (ACL), rule sets, Lambda function, and logging S3 bucket. Full blog post: http://blogs.aws.amazon.com/security/post/Tx223ZW25YRPRKV/How-to-Use-AWS-WAF-to-Block-IP-Addresses-That-Generate-Bad-Requests

An AWS CloudFormation template that creates an AWS WAF Web ACL, Rules, and IP Sets, an AWS Lambda function and CloudWatch Scheduled Event. The Lambda function imports multiple IP reputation lists and updates AWS WAF IP Sets in order to deny access from the IP ranges defined in those lists. Amazon CloudWatch Scheduled Events is utilised to execute the function regularly in order to automate the update of the IP Sets as the lists are updated.

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