353 lines
10 KiB
Ruby
353 lines
10 KiB
Ruby
# frozen_string_literal: true
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require 'method_profiler'
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require 'middleware/anonymous_cache'
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class Middleware::RequestTracker
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@@detailed_request_loggers = nil
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@@ip_skipper = nil
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# You can add exceptions to our app rate limiter in the app.yml ENV section.
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# example:
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#
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# env:
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# DISCOURSE_MAX_REQS_PER_IP_EXCEPTIONS: >-
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# 14.15.16.32/27
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# 216.148.1.2
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#
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STATIC_IP_SKIPPER = ENV['DISCOURSE_MAX_REQS_PER_IP_EXCEPTIONS']&.split&.map { |ip| IPAddr.new(ip) }
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# register callbacks for detailed request loggers called on every request
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# example:
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#
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# Middleware::RequestTracker.detailed_request_logger(->|env, data| do
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# # do stuff with env and data
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# end
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def self.register_detailed_request_logger(callback)
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MethodProfiler.ensure_discourse_instrumentation!
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(@@detailed_request_loggers ||= []) << callback
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end
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def self.unregister_detailed_request_logger(callback)
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@@detailed_request_loggers.delete(callback)
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if @@detailed_request_loggers.length == 0
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@detailed_request_loggers = nil
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end
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end
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# used for testing
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def self.unregister_ip_skipper
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@@ip_skipper = nil
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end
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# Register a custom `ip_skipper`, a function that will skip rate limiting
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# for any IP that returns true.
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#
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# For example, if you never wanted to rate limit 1.2.3.4
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#
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# ```
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# Middleware::RequestTracker.register_ip_skipper do |ip|
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# ip == "1.2.3.4"
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# end
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# ```
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def self.register_ip_skipper(&blk)
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raise "IP skipper is already registered!" if @@ip_skipper
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@@ip_skipper = blk
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end
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def self.ip_skipper
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@@ip_skipper
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end
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def initialize(app, settings = {})
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@app = app
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end
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def self.log_request(data)
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status = data[:status]
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track_view = data[:track_view]
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if track_view
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if data[:is_crawler]
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ApplicationRequest.increment!(:page_view_crawler)
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WebCrawlerRequest.increment!(data[:user_agent])
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elsif data[:has_auth_cookie]
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ApplicationRequest.increment!(:page_view_logged_in)
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ApplicationRequest.increment!(:page_view_logged_in_mobile) if data[:is_mobile]
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elsif !SiteSetting.login_required
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ApplicationRequest.increment!(:page_view_anon)
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ApplicationRequest.increment!(:page_view_anon_mobile) if data[:is_mobile]
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end
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end
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ApplicationRequest.increment!(:http_total)
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if status >= 500
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ApplicationRequest.increment!(:http_5xx)
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elsif data[:is_background]
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ApplicationRequest.increment!(:http_background)
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elsif status >= 400
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ApplicationRequest.increment!(:http_4xx)
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elsif status >= 300
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ApplicationRequest.increment!(:http_3xx)
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elsif status >= 200
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ApplicationRequest.increment!(:http_2xx)
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end
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end
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def self.get_data(env, result, timing, request = nil)
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status, headers = result
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status = status.to_i
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request ||= Rack::Request.new(env)
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helper = Middleware::AnonymousCache::Helper.new(env, request)
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env_track_view = env["HTTP_DISCOURSE_TRACK_VIEW"]
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track_view = status == 200
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track_view &&= env_track_view != "0" && env_track_view != "false"
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track_view &&= env_track_view || (request.get? && !request.xhr? && headers["Content-Type"] =~ /text\/html/)
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track_view = !!track_view
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has_auth_cookie = Auth::DefaultCurrentUserProvider.find_v0_auth_cookie(request).present?
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has_auth_cookie ||= Auth::DefaultCurrentUserProvider.find_v1_auth_cookie(env).present?
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h = {
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status: status,
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is_crawler: helper.is_crawler?,
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has_auth_cookie: has_auth_cookie,
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is_background: !!(request.path =~ /^\/message-bus\// || request.path =~ /\/topics\/timings/),
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is_mobile: helper.is_mobile?,
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track_view: track_view,
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timing: timing,
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queue_seconds: env['REQUEST_QUEUE_SECONDS']
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}
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if h[:is_crawler]
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user_agent = env['HTTP_USER_AGENT']
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if user_agent && (user_agent.encoding != Encoding::UTF_8)
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user_agent = user_agent.encode("utf-8")
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user_agent.scrub!
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end
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h[:user_agent] = user_agent
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end
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if cache = headers["X-Discourse-Cached"]
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h[:cache] = cache
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end
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h
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end
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def log_request_info(env, result, info, request = nil)
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# we got to skip this on error ... its just logging
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data = self.class.get_data(env, result, info, request) rescue nil
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if data
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if result && (headers = result[1])
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headers["X-Discourse-TrackView"] = "1" if data[:track_view]
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end
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if @@detailed_request_loggers
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@@detailed_request_loggers.each { |logger| logger.call(env, data) }
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end
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log_later(data)
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end
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end
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def self.populate_request_queue_seconds!(env)
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if !env['REQUEST_QUEUE_SECONDS']
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if queue_start = env['HTTP_X_REQUEST_START']
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queue_start = if queue_start.start_with?("t=")
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queue_start.split("t=")[1].to_f
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else
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queue_start.to_f / 1000.0
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end
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queue_time = (Time.now.to_f - queue_start)
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env['REQUEST_QUEUE_SECONDS'] = queue_time
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end
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end
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end
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def call(env)
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result = nil
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info = nil
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# doing this as early as possible so we have an
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# accurate counter
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::Middleware::RequestTracker.populate_request_queue_seconds!(env)
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request = Rack::Request.new(env)
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cookie = find_auth_cookie(env)
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if error_details = rate_limit(request, cookie)
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available_in, error_code = error_details
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message = <<~TEXT
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Slow down, too many requests from this IP address.
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Please retry again in #{available_in} seconds.
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Error code: #{error_code}.
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TEXT
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headers = {
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"Retry-After" => available_in.to_s,
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"Discourse-Rate-Limit-Error-Code" => error_code
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}
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return [429, headers, [message]]
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end
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env["discourse.request_tracker"] = self
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MethodProfiler.start
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result = @app.call(env)
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info = MethodProfiler.stop
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# possibly transferred?
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if info && (headers = result[1])
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headers["X-Runtime"] = "%0.6f" % info[:total_duration]
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if GlobalSetting.enable_performance_http_headers
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if redis = info[:redis]
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headers["X-Redis-Calls"] = redis[:calls].to_s
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headers["X-Redis-Time"] = "%0.6f" % redis[:duration]
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end
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if sql = info[:sql]
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headers["X-Sql-Calls"] = sql[:calls].to_s
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headers["X-Sql-Time"] = "%0.6f" % sql[:duration]
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end
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if queue = env['REQUEST_QUEUE_SECONDS']
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headers["X-Queue-Time"] = "%0.6f" % queue
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end
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end
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end
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if env[Auth::DefaultCurrentUserProvider::BAD_TOKEN] && (headers = result[1])
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headers['Discourse-Logged-Out'] = '1'
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end
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result
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ensure
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if (limiters = env['DISCOURSE_RATE_LIMITERS']) && env['DISCOURSE_IS_ASSET_PATH']
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limiters.each(&:rollback!)
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env['DISCOURSE_ASSET_RATE_LIMITERS'].each do |limiter|
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begin
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limiter.performed!
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rescue RateLimiter::LimitExceeded
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# skip
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end
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end
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end
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if !env["discourse.request_tracker.skip"]
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log_request_info(env, result, info, request)
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end
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end
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def log_later(data)
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Scheduler::Defer.later("Track view") do
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unless Discourse.pg_readonly_mode?
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self.class.log_request(data)
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end
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end
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end
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def find_auth_cookie(env)
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min_allowed_timestamp = Time.now.to_i - (UserAuthToken::ROTATE_TIME_MINS + 1) * 60
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cookie = Auth::DefaultCurrentUserProvider.find_v1_auth_cookie(env)
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if cookie && cookie[:issued_at] >= min_allowed_timestamp
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cookie
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end
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end
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def is_private_ip?(ip)
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ip = IPAddr.new(ip)
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!!(ip && (ip.private? || ip.loopback?))
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rescue IPAddr::AddressFamilyError, IPAddr::InvalidAddressError
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false
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end
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def rate_limit(request, cookie)
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warn = GlobalSetting.max_reqs_per_ip_mode == "warn" ||
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GlobalSetting.max_reqs_per_ip_mode == "warn+block"
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block = GlobalSetting.max_reqs_per_ip_mode == "block" ||
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GlobalSetting.max_reqs_per_ip_mode == "warn+block"
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return if !block && !warn
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ip = request.ip
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if !GlobalSetting.max_reqs_rate_limit_on_private
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return if is_private_ip?(ip)
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end
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return if @@ip_skipper&.call(ip)
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return if STATIC_IP_SKIPPER&.any? { |entry| entry.include?(ip) }
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ip_or_id = ip
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limit_on_id = false
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if cookie && cookie[:user_id] && cookie[:trust_level] && cookie[:trust_level] >= GlobalSetting.skip_per_ip_rate_limit_trust_level
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ip_or_id = cookie[:user_id]
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limit_on_id = true
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end
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limiter10 = RateLimiter.new(
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nil,
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"global_ip_limit_10_#{ip_or_id}",
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GlobalSetting.max_reqs_per_ip_per_10_seconds,
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10,
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global: !limit_on_id,
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aggressive: true,
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error_code: limit_on_id ? "id_10_secs_limit" : "ip_10_secs_limit"
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)
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limiter60 = RateLimiter.new(
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nil,
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"global_ip_limit_60_#{ip_or_id}",
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GlobalSetting.max_reqs_per_ip_per_minute,
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60,
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global: !limit_on_id,
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error_code: limit_on_id ? "id_60_secs_limit" : "ip_60_secs_limit",
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aggressive: true
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)
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limiter_assets10 = RateLimiter.new(
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nil,
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"global_ip_limit_10_assets_#{ip_or_id}",
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GlobalSetting.max_asset_reqs_per_ip_per_10_seconds,
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10,
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error_code: limit_on_id ? "id_assets_10_secs_limit" : "ip_assets_10_secs_limit",
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global: !limit_on_id
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)
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request.env['DISCOURSE_RATE_LIMITERS'] = [limiter10, limiter60]
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request.env['DISCOURSE_ASSET_RATE_LIMITERS'] = [limiter_assets10]
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if !limiter_assets10.can_perform?
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if warn
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Discourse.warn("Global asset IP rate limit exceeded for #{ip}: 10 second rate limit", uri: request.env["REQUEST_URI"])
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end
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if block
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return [
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limiter_assets10.seconds_to_wait(Time.now.to_i),
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limiter_assets10.error_code
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]
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end
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end
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begin
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type = 10
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limiter10.performed!
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type = 60
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limiter60.performed!
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nil
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rescue RateLimiter::LimitExceeded => e
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if warn
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Discourse.warn("Global IP rate limit exceeded for #{ip}: #{type} second rate limit", uri: request.env["REQUEST_URI"])
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end
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if block
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[e.available_in, e.error_code]
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else
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nil
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end
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end
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end
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end
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