Module: Datadog::AppSec::Contrib::Rack::Gateway::Watcher

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

Overview

Watcher for Rack gateway events

Class Method Summary collapse

Class Method Details

.watch ⇒ Object 



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

def watch
  gateway = Instrumentation.gateway

  watch_request(gateway)
  watch_response(gateway)
  watch_request_body(gateway)
  watch_request_finish(gateway)
end

.watch_request(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 25

def watch_request(gateway = Instrumentation.gateway)
  gateway.watch('rack.request', :appsec) do |stack, gateway_request|
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY]

    persistent_data = {
      'server.request.cookies' => gateway_request.cookies,
      'server.request.query' => gateway_request.query,
      'server.request.uri.raw' => gateway_request.fullpath,
      'server.request.headers' => gateway_request.headers,
      'server.request.headers.no_cookies' => gateway_request.headers.dup.tap { |h| h.delete('cookie') },
      'http.client_ip' => gateway_request.client_ip,
      'server.request.method' => gateway_request.method
    }

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

    if result.match? || !result.derivatives.empty?
      context.events.push(
        AppSec::SecurityEvent.new(result, trace: context.trace, span: context.span)
      )
    end

    if result.match?
      AppSec::Event.tag_and_keep!(context, result)
      AppSec::ActionsHandler.handle(result.actions)
    end

    stack.call(gateway_request.request)
  end
end

.watch_request_body(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 82

def watch_request_body(gateway = Instrumentation.gateway)
  gateway.watch('rack.request.body', :appsec) do |stack, gateway_request|
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY]

    persistent_data = {
      'server.request.body' => gateway_request.form_hash
    }

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

    if result.match?
      AppSec::Event.tag_and_keep!(context, result)

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

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

    stack.call(gateway_request.request)
  end
end

.watch_request_finish(gateway = Instrumentation.gateway) ⇒ Object

NOTE: In the current state we unable to substibe twice to the same

event within the same group. Ideally this code should live
somewhere closer to identity related monitor.

WARNING: The Gateway is a subject of refactoring



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 110

def watch_request_finish(gateway = Instrumentation.gateway)
  gateway.watch('rack.request.finish', :appsec) do |stack, gateway_request|
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY]

    if context.span.nil? || !gateway.pushed?('appsec.events.user_lifecycle')
      next stack.call(gateway_request.request)
    end

    gateway_request.headers.each do |name, value|
      if !Ext::COLLECTABLE_REQUEST_HEADERS.include?(name) &&
          !Ext::IDENTITY_COLLECTABLE_REQUEST_HEADERS.include?(name)
        next
      end

      context.span["http.request.headers.#{name}"] ||= value
    end

    stack.call(gateway_request.request)
  end
end

.watch_response(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 56

def watch_response(gateway = Instrumentation.gateway)
  gateway.watch('rack.response', :appsec) do |stack, gateway_response|
    context = gateway_response.context

    persistent_data = {
      'server.response.status' => gateway_response.status.to_s,
      'server.response.headers' => gateway_response.headers,
      'server.response.headers.no_cookies' => gateway_response.headers.dup.tap { |h| h.delete('set-cookie') }
    }

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

    if result.match?
      AppSec::Event.tag_and_keep!(context, result)

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

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

    stack.call(gateway_response.response)
  end
end