Module: Datadog::AppSec::Contrib::Rails::Gateway::Watcher

Defined in:
lib/datadog/appsec/contrib/rails/gateway/watcher.rb

Overview

Watcher for Rails gateway events

Class Method Summary collapse

Class Method Details

.watch ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rails/gateway/watcher.rb', line 16

def watch
  gateway = Instrumentation.gateway

  watch_request_action(gateway)
  watch_response_body_json(gateway)
end

.watch_request_action(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rails/gateway/watcher.rb', line 23

def watch_request_action(gateway = Instrumentation.gateway)
  gateway.watch("rails.request.action") do |stack, gateway_request|
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY]
    limit = Datadog.configuration.appsec.body_parsing_size_limit

    persistent_data = {
      "server.request.path_params" => gateway_request.route_params,
    }

    unless limit.zero?
      byte_length = gateway_request.body_bytesize(limit)

      if byte_length
        # NOTE: Params may be parsed before this hook, leaving the
        #       body stream at EOF. Keep byte_length unset for that
        #       case, but still inspect cached params
        persistent_data["server.request.body.byte_length"] = byte_length if byte_length.positive?

        if byte_length <= limit
          body = gateway_request.parsed_body
          persistent_data["server.request.body"] = body unless body.nil? || body.empty?
        end
      end
    end

    result = context.run_waf(persistent_data, {}, Datadog.configuration.appsec.waf_timeout)

    if result.match?
      context.events.push(
        AppSec::SecurityEvent.new(result, trace: context.trace, span: context.span)
      )

      AppSec::Event.tag(context, result)
      TraceKeeper.keep!(context.trace) if result.keep?

      AppSec::ActionsHandler.handle(result.actions)
    end

    stack.call(gateway_request.request)
  end
end

.watch_response_body_json(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rails/gateway/watcher.rb', line 65

def watch_response_body_json(gateway = Instrumentation.gateway)
  gateway.watch("rails.response.body.json") do |stack, container|
    context = container.context

    persistent_data = {
      "server.response.body" => container.data,
    }
    result = context.run_waf(persistent_data, {}, Datadog.configuration.appsec.waf_timeout)

    if result.match?
      context.events.push(
        AppSec::SecurityEvent.new(result, trace: context.trace, span: context.span)
      )

      AppSec::Event.tag(context, result)
      TraceKeeper.keep!(context.trace) if result.keep?

      AppSec::ActionsHandler.handle(result.actions)
    end

    stack.call(container)
  end
end