Class: Datadog::AppSec::Contrib::Faraday::SSRFDetectionMiddleware

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/datadog/appsec/contrib/faraday/ssrf_detection_middleware.rb

Overview

AppSec SSRF detection Middleware for Faraday

Constant Summary collapse

REDIRECT_STATUS_CODES = 
(300..399).freeze
SAMPLE_BODY_KEY = 
:__datadog_appsec_sample_downstream_body

Instance Method Summary collapse

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/faraday/ssrf_detection_middleware.rb', line 18

def call(env)
  context = AppSec.active_context
  return @app.call(env) unless context && AppSec.rasp_enabled?

  url = env.url.to_s
  headers = normalize_headers(env.request_headers)
  # @type var ephemeral_data: ::Datadog::AppSec::Context::input_data
  ephemeral_data = {
    'server.io.net.url' => url,
    'server.io.net.request.method' => env.method.to_s.upcase,
    'server.io.net.request.headers' => headers
  }

  is_redirect = context.state[:downstream_redirect_url] == url
  if is_redirect
    context.state.delete(:downstream_redirect_url)
    env[SAMPLE_BODY_KEY] = true
  else
    mark_body_sampling!(env, context: context)
  end

  if !is_redirect && env[SAMPLE_BODY_KEY]
    body = parse_body(env.body, content_type: headers['content-type'])
    ephemeral_data['server.io.net.request.body'] = body if body
  end

  timeout = Datadog.configuration.appsec.waf_timeout
  result = context.run_rasp(Ext::RASP_SSRF, {}, ephemeral_data, timeout, phase: Ext::RASP_REQUEST_PHASE)
  handle(result, context: context) if result.match?

  @app.call(env).on_complete { |response_env| on_complete(response_env, context: context) }
end