357 lines
11 KiB
Ruby
357 lines
11 KiB
Ruby
# frozen_string_literal: true
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require 'ipaddr'
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require 'socket'
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require 'resolv'
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# Use our own timeout class to avoid using HTTP.rb's timeout block
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# around the Socket#open method, since we use our own timeout blocks inside
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# that method
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#
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# Also changes how the read timeout behaves so that it is cumulative (closer
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# to HTTP::Timeout::Global, but still having distinct timeouts for other
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# operation types)
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class PerOperationWithDeadline < HTTP::Timeout::PerOperation
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READ_DEADLINE = 30
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def initialize(*args)
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super
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@read_deadline = options.fetch(:read_deadline, READ_DEADLINE)
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end
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def connect(socket_class, host, port, nodelay = false)
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@socket = socket_class.open(host, port)
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@socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1) if nodelay
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end
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# Reset deadline when the connection is re-used for different requests
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def reset_counter
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@deadline = nil
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end
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# Read data from the socket
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def readpartial(size, buffer = nil)
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@deadline ||= Process.clock_gettime(Process::CLOCK_MONOTONIC) + @read_deadline
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timeout = false
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loop do
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result = @socket.read_nonblock(size, buffer, exception: false)
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return :eof if result.nil?
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remaining_time = @deadline - Process.clock_gettime(Process::CLOCK_MONOTONIC)
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raise HTTP::TimeoutError, "Read timed out after #{@read_timeout} seconds" if timeout
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raise HTTP::TimeoutError, "Read timed out after a total of #{@read_deadline} seconds" if remaining_time <= 0
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return result if result != :wait_readable
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# marking the socket for timeout. Why is this not being raised immediately?
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# it seems there is some race-condition on the network level between calling
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# #read_nonblock and #wait_readable, in which #read_nonblock signalizes waiting
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# for reads, and when waiting for x seconds, it returns nil suddenly without completing
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# the x seconds. In a normal case this would be a timeout on wait/read, but it can
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# also mean that the socket has been closed by the server. Therefore we "mark" the
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# socket for timeout and try to read more bytes. If it returns :eof, it's all good, no
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# timeout. Else, the first timeout was a proper timeout.
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# This hack has to be done because io/wait#wait_readable doesn't provide a value for when
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# the socket is closed by the server, and HTTP::Parser doesn't provide the limit for the chunks.
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timeout = true unless @socket.to_io.wait_readable([remaining_time, @read_timeout].min)
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end
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end
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end
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class Request
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REQUEST_TARGET = '(request-target)'
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# We enforce a 5s timeout on DNS resolving, 5s timeout on socket opening
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# and 5s timeout on the TLS handshake, meaning the worst case should take
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# about 15s in total
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TIMEOUT = { connect_timeout: 5, read_timeout: 10, write_timeout: 10, read_deadline: 30 }.freeze
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include RoutingHelper
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def initialize(verb, url, **options)
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raise ArgumentError if url.blank?
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@verb = verb
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@url = Addressable::URI.parse(url).normalize
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@http_client = options.delete(:http_client)
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@allow_local = options.delete(:allow_local)
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@full_path = options.delete(:with_query_string)
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@options = options.merge(socket_class: use_proxy? || @allow_local ? ProxySocket : Socket)
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@options = @options.merge(timeout_class: PerOperationWithDeadline, timeout_options: TIMEOUT)
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@options = @options.merge(proxy_url) if use_proxy?
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@headers = {}
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raise Mastodon::HostValidationError, 'Instance does not support hidden service connections' if block_hidden_service?
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set_common_headers!
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set_digest! if options.key?(:body)
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end
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def on_behalf_of(actor, sign_with: nil)
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raise ArgumentError, 'actor must not be nil' if actor.nil?
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@actor = actor
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@keypair = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : @actor.keypair
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self
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end
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def add_headers(new_headers)
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@headers.merge!(new_headers)
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self
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end
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def perform
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begin
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response = http_client.public_send(@verb, @url.to_s, @options.merge(headers: headers))
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rescue => e
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raise e.class, "#{e.message} on #{@url}", e.backtrace[0]
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end
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begin
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# If we are using a persistent connection, we have to
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# read every response to be able to move forward at all.
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# However, simply calling #to_s or #flush may not be safe,
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# as the response body, if malicious, could be too big
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# for our memory. So we use the #body_with_limit method
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response.body_with_limit if http_client.persistent?
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yield response if block_given?
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ensure
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http_client.close unless http_client.persistent?
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end
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end
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def headers
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(@actor ? @headers.merge('Signature' => signature) : @headers).without(REQUEST_TARGET)
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end
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class << self
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def valid_url?(url)
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begin
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parsed_url = Addressable::URI.parse(url)
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rescue Addressable::URI::InvalidURIError
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return false
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end
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%w(http https).include?(parsed_url.scheme) && parsed_url.host.present?
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end
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def http_client
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HTTP.use(:auto_inflate).follow(max_hops: 3)
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end
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end
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private
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def set_common_headers!
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@headers[REQUEST_TARGET] = request_target
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@headers['User-Agent'] = Mastodon::Version.user_agent
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@headers['Host'] = @url.host
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@headers['Date'] = Time.now.utc.httpdate
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@headers['Accept-Encoding'] = 'gzip' if @verb != :head
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end
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def set_digest!
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@headers['Digest'] = "SHA-256=#{Digest::SHA256.base64digest(@options[:body])}"
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end
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def request_target
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if @url.query.nil? || !@full_path
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"#{@verb} #{@url.path}"
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else
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"#{@verb} #{@url.path}?#{@url.query}"
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end
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end
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def signature
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algorithm = 'rsa-sha256'
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signature = Base64.strict_encode64(@keypair.sign(OpenSSL::Digest.new('SHA256'), signed_string))
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"keyId=\"#{key_id}\",algorithm=\"#{algorithm}\",headers=\"#{signed_headers.keys.join(' ').downcase}\",signature=\"#{signature}\""
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end
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def signed_string
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signed_headers.map { |key, value| "#{key.downcase}: #{value}" }.join("\n")
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end
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def signed_headers
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@headers.without('User-Agent', 'Accept-Encoding')
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end
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def key_id
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ActivityPub::TagManager.instance.key_uri_for(@actor)
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end
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def http_client
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@http_client ||= Request.http_client
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end
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def use_proxy?
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proxy_url.present?
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end
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def proxy_url
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if hidden_service? && Rails.configuration.x.http_client_hidden_proxy.present?
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Rails.configuration.x.http_client_hidden_proxy
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else
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Rails.configuration.x.http_client_proxy
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end
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end
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def block_hidden_service?
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!Rails.configuration.x.access_to_hidden_service && hidden_service?
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end
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def hidden_service?
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/\.(onion|i2p)$/.match?(@url.host)
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end
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module ClientLimit
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def truncated_body(limit = 1.megabyte)
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if charset.nil?
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encoding = Encoding::BINARY
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else
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begin
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encoding = Encoding.find(charset)
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rescue ArgumentError
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encoding = Encoding::BINARY
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end
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end
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contents = String.new(encoding: encoding)
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while (chunk = readpartial)
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contents << chunk
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chunk.clear
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break if contents.bytesize > limit
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end
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contents
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end
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def body_with_limit(limit = 1.megabyte)
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raise Mastodon::LengthValidationError if content_length.present? && content_length > limit
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contents = truncated_body(limit)
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raise Mastodon::LengthValidationError if contents.bytesize > limit
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contents
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end
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end
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if ::HTTP::Response.methods.include?(:body_with_limit) && !Rails.env.production?
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abort 'HTTP::Response#body_with_limit is already defined, the monkey patch will not be applied'
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else
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class ::HTTP::Response
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include Request::ClientLimit
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end
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end
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class Socket < TCPSocket
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class << self
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def open(host, *args)
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outer_e = nil
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port = args.first
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addresses = []
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begin
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addresses = [IPAddr.new(host)]
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rescue IPAddr::InvalidAddressError
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Resolv::DNS.open do |dns|
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dns.timeouts = 5
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addresses = dns.getaddresses(host)
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addresses = addresses.filter { |addr| addr.is_a?(Resolv::IPv6) }.take(2) + addresses.filter { |addr| !addr.is_a?(Resolv::IPv6) }.take(2)
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end
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end
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socks = []
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addr_by_socket = {}
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addresses.each do |address|
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begin
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check_private_address(address, host)
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sock = ::Socket.new(address.is_a?(Resolv::IPv6) ? ::Socket::AF_INET6 : ::Socket::AF_INET, ::Socket::SOCK_STREAM, 0)
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sockaddr = ::Socket.pack_sockaddr_in(port, address.to_s)
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sock.setsockopt(::Socket::IPPROTO_TCP, ::Socket::TCP_NODELAY, 1)
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sock.connect_nonblock(sockaddr)
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# If that hasn't raised an exception, we somehow managed to connect
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# immediately, close pending sockets and return immediately
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socks.each(&:close)
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return sock
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rescue IO::WaitWritable
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socks << sock
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addr_by_socket[sock] = sockaddr
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rescue => e
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outer_e = e
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end
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end
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until socks.empty?
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_, available_socks, = IO.select(nil, socks, nil, Request::TIMEOUT[:connect_timeout])
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if available_socks.nil?
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socks.each(&:close)
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raise HTTP::TimeoutError, "Connect timed out after #{Request::TIMEOUT[:connect_timeout]} seconds"
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end
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available_socks.each do |sock|
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socks.delete(sock)
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begin
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sock.connect_nonblock(addr_by_socket[sock])
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rescue Errno::EISCONN
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# Do nothing
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rescue => e
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sock.close
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outer_e = e
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next
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end
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socks.each(&:close)
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return sock
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end
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end
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if outer_e
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raise outer_e
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else
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raise SocketError, "No address for #{host}"
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end
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end
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alias new open
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def check_private_address(address, host)
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addr = IPAddr.new(address.to_s)
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return if private_address_exceptions.any? { |range| range.include?(addr) }
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raise Mastodon::PrivateNetworkAddressError, host if PrivateAddressCheck.private_address?(addr)
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end
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def private_address_exceptions
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@private_address_exceptions = begin
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(ENV['ALLOWED_PRIVATE_ADDRESSES'] || '').split(',').map { |addr| IPAddr.new(addr) }
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end
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end
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end
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end
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class ProxySocket < Socket
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class << self
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def check_private_address(_address, _host)
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# Accept connections to private addresses as HTTP proxies will usually
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# be on local addresses
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nil
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end
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end
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end
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private_constant :ClientLimit, :Socket, :ProxySocket
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end
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