Module: Datadog::AppSec::Contrib::Sinatra::Gateway::Watcher

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

Overview

Watcher for Sinatra gateway events

Class Method Summary collapse

Class Method Details

.watch ⇒ Object 



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

def watch
  gateway = Instrumentation.gateway

  watch_request_dispatch(gateway)
  watch_request_routed(gateway)
  watch_response_body_json(gateway)
end

.watch_request_dispatch(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/sinatra/gateway/watcher.rb', line 24

def watch_request_dispatch(gateway = Instrumentation.gateway)
  gateway.watch("sinatra.request.dispatch") do |stack, gateway_request|
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY] # : Context

    context.state[:web_framework] = "sinatra"

    request = gateway_request.request
    next stack.call(request) unless gateway_request.collectable_body?

    # NOTE: A limit of 0 disables request body collection entirely.
    limit = Datadog.configuration.appsec.body_parsing_size_limit
    next stack.call(request) if limit.zero?

    persistent_data = {}
    byte_length = gateway_request.body_bytesize(limit)

    if byte_length
      persistent_data["server.request.body.byte_length"] = byte_length

      if byte_length <= limit
        body = gateway_request.form_hash
        persistent_data["server.request.body"] = body if body
      end
    # NOTE: Body was parsed before measurement, keep byte_length unset
    elsif gateway_request.env.key?("rack.request.form_hash")
      body = gateway_request.env["rack.request.form_hash"]
      persistent_data["server.request.body"] = body if body
    end

    next stack.call(request) if persistent_data.empty?

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

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

    if result.match?
      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_request_routed(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/sinatra/gateway/watcher.rb', line 74

def watch_request_routed(gateway = Instrumentation.gateway)
  gateway.watch("sinatra.request.routed") do |stack, args|
    gateway_request, gateway_route_params = args # : [Gateway::Request, Gateway::RouteParams]
    context = gateway_request.env[AppSec::Ext::CONTEXT_KEY] # : Context

    persistent_data = {
      "server.request.path_params" => gateway_route_params.params,
    }

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

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

      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_response_body_json(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/sinatra/gateway/watcher.rb', line 100

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