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require 'nokogiri'
require 'resolv'
module CryptCheck
module Tls
module Xmpp
TLS_NAMESPACE = 'urn:ietf:params:xml:ns:xmpp-tls'
RESOLVER = Resolv::DNS.new
class Server < Tls::TcpServer
attr_reader :domain
def initialize(domain, type=:s2s, hostname: nil)
@type, @domain = type, domain
service, port = case type
when :s2s then ['_xmpp-server', 5269]
when :c2s then ['_xmpp-client', 5222]
end
unless hostname
srv = RESOLVER.getresources("#{service}._tcp.#{domain}", Resolv::DNS::Resource::IN::SRV).sort_by(&:priority).first
if srv
hostname, port = srv.target.to_s, srv.port
else # DNS is not correctly set, guess config…
hostname = domain
end
end
super hostname, port
Logger.info { '' }
Logger.info { self.required? ? 'Required'.colorize(:green) : 'Not required'.colorize(:yellow) }
end
def ssl_connect(socket, context, method, &block)
type = case @type
when :s2s then 'jabber:server'
when :c2s then 'jabber:client'
end
socket.write "<?xml version='1.0' ?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='#{type}' to='#{@domain}' version='1.0'>"
response = ''
loop do
response += socket.recv 1024
xml = ::Nokogiri::XML response
unless xml.xpath('//stream:features').empty?
response = xml
break
end
end
starttls = response.xpath '//tls:starttls', tls: TLS_NAMESPACE
raise TLSNotAvailableException unless starttls
@required = !starttls.xpath('//tls:required', tls: TLS_NAMESPACE).nil?
socket.write "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls' />\r\n"
response = ::Nokogiri::XML socket.recv 4096
raise TLSNotAvailableException unless response.xpath '//tls:proceed', tls: TLS_NAMESPACE
super
end
def required?
@required
end
end
end
end
end