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240 lines
6.6 KiB
240 lines
6.6 KiB
# 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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# Monkey-patch the HTTP.rb timeout class to avoid using a 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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class HTTP::Timeout::PerOperation
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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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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: 5, read: 10, write: 10 }.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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@options = options.merge(use_proxy? ? Rails.configuration.x.http_client_proxy : { socket_class: Socket })
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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(account, key_id_format = :acct, sign_with: nil)
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raise ArgumentError unless account.local?
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@account = account
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@keypair = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : @account.keypair
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@key_id_format = key_id_format
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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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response = response.extend(ClientLimit)
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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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(@account ? @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).timeout(:per_operation, TIMEOUT.dup).follow(max_hops: 2)
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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] = "#{@verb} #{@url.path}"
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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 signature
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algorithm = 'rsa-sha256'
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signature = Base64.strict_encode64(@keypair.sign(OpenSSL::Digest::SHA256.new, 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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case @key_id_format
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when :acct
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@account.to_webfinger_s
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when :uri
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[ActivityPub::TagManager.instance.uri_for(@account), '#main-key'].join
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end
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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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Rails.configuration.x.http_client_proxy.present?
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end
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def block_hidden_service?
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!Rails.configuration.x.access_to_hidden_service && /\.(onion|i2p)$/.match(@url.host)
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end
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module ClientLimit
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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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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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raise Mastodon::LengthValidationError if contents.bytesize > limit
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end
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contents
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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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return super(host, *args) if thru_hidden_service?(host)
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outer_e = nil
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port = args.first
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Resolv::DNS.open do |dns|
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dns.timeouts = 5
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addresses = dns.getaddresses(host).take(2)
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addresses.each do |address|
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begin
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raise Mastodon::HostValidationError if PrivateAddressCheck.private_address?(IPAddr.new(address.to_s))
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sock = ::Socket.new(::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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begin
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sock.connect_nonblock(sockaddr)
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rescue IO::WaitWritable
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if IO.select(nil, [sock], nil, Request::TIMEOUT[:connect])
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begin
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sock.connect_nonblock(sockaddr)
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rescue Errno::EISCONN
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# Yippee!
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rescue
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sock.close
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raise
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end
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else
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sock.close
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raise HTTP::TimeoutError, "Connect timed out after #{Request::TIMEOUT[:connect]} seconds"
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end
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end
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return sock
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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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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 thru_hidden_service?(host)
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Rails.configuration.x.access_to_hidden_service && /\.(onion|i2p)$/.match(host)
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end
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end
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end
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private_constant :ClientLimit, :Socket
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end
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