A dirty patch for a number of Net::DNS/dns_enum issues
HD Moore
parent
dca2607d54
commit
c80017992a
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@ -87,6 +87,9 @@ module Net # :nodoc:
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#
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class Resolver
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class NextNameserver < RuntimeError
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end
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# An hash with the defaults values of almost all the
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# configuration parameters of a resolver object. See
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# the description for each parameter to have an
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@ -109,7 +112,7 @@ module Net # :nodoc:
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:ignore_truncated => false,
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:packet_size => 512,
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:tcp_timeout => TcpTimeout.new(120),
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:udp_timeout => UdpTimeout.new(0)}
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:udp_timeout => UdpTimeout.new(5)}
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# Create a new resolver object.
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#
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@ -887,8 +890,11 @@ module Net # :nodoc:
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end
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@logger.debug "Query(#{name},#{Net::DNS::RR::Types.new(type)},#{Net::DNS::RR::Classes.new(cls)})"
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send(name,type,cls)
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begin
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send(name,type,cls)
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rescue ::NoResponseError
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return
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end
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end
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@ -1011,13 +1017,13 @@ module Net # :nodoc:
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packet_data = packet.data
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packet_size = packet_data.size
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if @raw
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@logger.warn "AXFR query, switching to TCP over RAW socket"
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method = :send_raw_tcp
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else
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@logger.warn "AXFR query, switching to TCP"
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method = :send_tcp
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end
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if @raw
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@logger.warn "AXFR query, switching to TCP over RAW socket"
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method = :send_raw_tcp
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else
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@logger.warn "AXFR query, switching to TCP"
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method = :send_tcp
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end
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answers = []
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soa = 0
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@ -1026,7 +1032,7 @@ module Net # :nodoc:
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begin
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response = Net::DNS::Packet.parse(ans[0],ans[1])
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if response.answer[0].type == "SOA"
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if response && response.answer && response.answer[0] && response.answer[0].type == "SOA"
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soa += 1
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if soa >= 2
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break
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@ -1167,50 +1173,54 @@ module Net # :nodoc:
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sockaddr = Socket.pack_sockaddr_in(@config[:port],ns.to_s)
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@config[:tcp_timeout].timeout do
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catch "next nameserver" do
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socket.connect(sockaddr)
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@logger.info "Contacting nameserver #{ns} port #{@config[:port]}"
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socket.write(length+packet_data)
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got_something = false
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loop do
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buffer = ""
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socket.connect(sockaddr)
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@logger.info "Contacting nameserver #{ns} port #{@config[:port]}"
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socket.write(length+packet_data)
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got_something = false
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loop do
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buffer = ""
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begin
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ans = socket.recv(Net::DNS::INT16SZ)
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if ans.size == 0
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if got_something
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break #Proper exit from loop
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else
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@logger.warn "Connection reset to nameserver #{ns}, trying next."
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throw "next nameserver"
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end
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end
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got_something = true
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len = ans.unpack("n")[0]
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@logger.info "Receiving #{len} bytes..."
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if len == 0
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@logger.warn "Receiving 0 length packet from nameserver #{ns}, trying next."
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throw "next nameserver"
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end
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while (buffer.size < len)
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left = len - buffer.size
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temp,from = socket.recvfrom(left)
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buffer += temp
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end
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unless buffer.size == len
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@logger.warn "Malformed packet from nameserver #{ns}, trying next."
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throw "next nameserver"
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end
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if block_given?
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yield [buffer,["",@config[:port],ns.to_s,ns.to_s]]
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rescue ::Errno::ECONNRESET
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ans = ""
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end
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if ans.size == 0
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if got_something
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break #Proper exit from loop
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else
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return [buffer,["",@config[:port],ns.to_s,ns.to_s]]
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@logger.warn "Connection reset to nameserver #{ns}, trying next."
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raise NextNameserver
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end
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end
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got_something = true
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len = ans.unpack("n")[0]
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@logger.info "Receiving #{len} bytes..."
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if len == 0
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@logger.warn "Receiving 0 length packet from nameserver #{ns}, trying next."
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raise NextNameserver
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end
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while (buffer.size < len)
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left = len - buffer.size
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temp,from = socket.recvfrom(left)
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buffer += temp
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end
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unless buffer.size == len
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@logger.warn "Malformed packet from nameserver #{ns}, trying next."
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raise NextNameserver
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end
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if block_given?
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yield [buffer,["",@config[:port],ns.to_s,ns.to_s]]
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else
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return [buffer,["",@config[:port],ns.to_s,ns.to_s]]
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end
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end
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end
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rescue NextNameserver
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next
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rescue Timeout::Error
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@logger.warn "Nameserver #{ns} not responding within TCP timeout, trying next one"
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next
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@ -1,6 +1,6 @@
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# -*- coding: binary -*-
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#
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# $Id: RR.rb,v 1.19 2006/07/28 07:33:36 bluemonk Exp $
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# $Id: RR.rb,v 1.19 2006/07/28 07:33:36 bluemonk Exp $
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#
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require 'net/dns/names/names'
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@ -13,37 +13,37 @@ require 'net/dns/rr/classes'
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end
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module Net # :nodoc:
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module DNS
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module DNS
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# =Name
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#
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# Net::DNS::RR - DNS Resource Record class
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#
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# =Synopsis
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#
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#
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# require 'net/dns/rr'
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#
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# =Description
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#
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# The Net::DNS::RR is the base class for DNS Resource
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#
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# The Net::DNS::RR is the base class for DNS Resource
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# Record (RR) objects. A RR is a pack of data that represents
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# resources for a DNS zone. The form in which this data is
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# resources for a DNS zone. The form in which this data is
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# shows can be drawed as follow:
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#
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# "name ttl class type data"
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#
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#
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# The +name+ is the name of the resource, like an canonical
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# name for an +A+ record (internet ip address). The +ttl+ is the
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# time to live, expressed in seconds. +type+ and +class+ are
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# time to live, expressed in seconds. +type+ and +class+ are
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# respectively the type of resource (+A+ for ip addresses, +NS+
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# for nameservers, and so on) and the class, which is almost
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# for nameservers, and so on) and the class, which is almost
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# always +IN+, the Internet class. At the end, +data+ is the
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# value associated to the name for that particular type of
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# value associated to the name for that particular type of
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# resource record. An example:
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#
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# # A record for IP address
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# "www.example.com 86400 IN A 172.16.100.1"
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#
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#
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# # NS record for name server
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# "www.example.com 86400 IN NS ns.example.com"
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#
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@ -61,20 +61,20 @@ module Net # :nodoc:
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# * RRDataError: Error in parsing binary data, maybe from a malformed packet
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#
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# =Copyright
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#
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#
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# Copyright (c) 2006 Marco Ceresa
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#
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# All rights reserved. This program is free software; you may redistribute
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# All rights reserved. This program is free software; you may redistribute
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# it and/or modify it under the same terms as Ruby itself.
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#
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class RR
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include Net::DNS::Names
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# Regexp matching an RR string
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RR_REGEXP = Regexp.new("^\\s*(\\S+)\\s*(\\d+)?\\s+(" +
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Net::DNS::RR::Classes.regexp +
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Net::DNS::RR::Classes.regexp +
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"|CLASS\\d+)?\\s*(" +
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Net::DNS::RR::Types.regexp +
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Net::DNS::RR::Types.regexp +
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"|TYPE\\d+)?\\s*(.*)$", Regexp::IGNORECASE, 'n')
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# Dimension of the sum of class, type, TTL and rdlength fields in a
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@ -85,13 +85,13 @@ module Net # :nodoc:
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attr_reader :name
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# TTL time (in seconds) of the RR
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attr_reader :ttl
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# Data belonging to that appropriate class,
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# Data belonging to that appropriate class,
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# not to be used (use real accessors instead)
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attr_reader :rdata
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# Create a new instance of Net::DNS::RR class, or an instance of
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# any of the subclass of the appropriate type.
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#
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#
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# Argument can be a string or an hash. With a sting, we can pass
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# a RR resource record in the canonical format:
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#
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@ -101,12 +101,12 @@ module Net # :nodoc:
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# txt = Net::DNS::RR.new('baz.example.com 3600 HS TXT "text record"')
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#
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# Incidentally, +a+, +mx+, +cname+ and +txt+ objects will be instances of
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# respectively Net::DNS::RR::A, Net::DNS::RR::MX, Net::DNS::RR::CNAME and
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# respectively Net::DNS::RR::A, Net::DNS::RR::MX, Net::DNS::RR::CNAME and
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# Net::DNS::RR::TXT classes.
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#
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# The name and RR data are required; all other informations are optional.
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# The name and RR data are required; all other informations are optional.
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# If omitted, the +TTL+ defaults to 10800, +type+ default to +A+ and the RR class
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# defaults to +IN+. Omitting the optional fields is useful for creating the
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# defaults to +IN+. Omitting the optional fields is useful for creating the
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# empty RDATA sections required for certain dynamic update operations.
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# All names must be fully qualified. The trailing dot (.) is optional.
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#
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@ -125,12 +125,12 @@ module Net # :nodoc:
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# :rdata => "10.1.2.3"
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# )
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#
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# Name and data are required; all the others fields are optionals like
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# we've seen before. The data field can be specified either with the
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# Name and data are required; all the others fields are optionals like
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# we've seen before. The data field can be specified either with the
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# right name of the resource (+:address+ in the example above) or with
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# the generic key +:rdata+. Consult documentation to find the exact name
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# for the resource in each subclass.
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#
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#
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def initialize(arg)
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case arg
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when String
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@ -157,18 +157,18 @@ module Net # :nodoc:
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#
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# This method is used when parsing a binary packet by the Packet
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# class.
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#
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#
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def RR.parse(data)
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o = allocate
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obj,offset = o.send(:new_from_binary, data, 0)
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return obj
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end
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# Same as RR.parse, but takes an entire packet binary data to
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# Same as RR.parse, but takes an entire packet binary data to
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# perform name expansion. Default when analizing a packet
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# just received from a network stream.
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#
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# Return an instance of appropriate class and the offset
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# Return an instance of appropriate class and the offset
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# pointing at the end of the data parsed.
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#
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def RR.parse_packet(data,offset)
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@ -176,12 +176,12 @@ module Net # :nodoc:
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o.send(:new_from_binary,data,offset)
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end
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# Return the RR object in binary data format, suitable
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# for using in network streams, with names compressed.
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# Return the RR object in binary data format, suitable
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# for using in network streams, with names compressed.
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# Must pass as arguments the offset inside the packet
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# and an hash of compressed names.
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#
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# This method is to be used in other classes and is
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# This method is to be used in other classes and is
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# not intended for user space programs.
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#
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# TO FIX in one of the future releases
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@ -193,8 +193,8 @@ module Net # :nodoc:
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offset += Net::DNS::RRFIXEDSZ
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return str,offset,names
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end
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# Return the RR object in binary data format, suitable
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# Return the RR object in binary data format, suitable
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# for using in network streams.
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#
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# raw_data = rr.data
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@ -205,17 +205,17 @@ module Net # :nodoc:
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str = pack_name(@name)
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return str + [type,cls,@ttl,@rdlength].pack("n2 N n") + get_data
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end
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# Canonical inspect method
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# Canonical inspect method
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#
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# mx = Net::DNS::RR.new("example.com. 7200 MX 10 mailhost.example.com.")
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# #=> example.com. 7200 IN MX 10 mailhost.example.com.
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#
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def inspect
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data = get_inspect
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data = get_inspect
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# Returns the preformatted string
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if @name.size < 24
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[@name, @ttl.to_s, @cls.to_s, @type.to_s,
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[@name, @ttl.to_s, @cls.to_s, @type.to_s,
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data].pack("A24 A8 A8 A8 A*")
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else
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to_a.join(" ")
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@ -241,26 +241,26 @@ module Net # :nodoc:
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def to_a
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[@name,@ttl,@cls.to_s,@type.to_s,get_inspect]
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end
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# Type accessor
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def type
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@type.to_s
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end
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# Class accessor
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def cls
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@cls.to_s
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end
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private
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#---
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# New RR with argument in string form
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#---
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def new_from_string(rrstring)
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unless rrstring =~ RR_REGEXP
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raise RRArgumentError,
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raise RRArgumentError,
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"Format error for RR string (maybe CLASS and TYPE not valid?)"
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end
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@ -270,19 +270,19 @@ module Net # :nodoc:
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rescue NoMethodError
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raise RRArgumentError, "Missing name field in RR string #{rrstring}"
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end
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# Time to live for RR, default 3 hours
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@ttl = $2 ? $2.to_i : 10800
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# RR class, default to IN
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@cls = Net::DNS::RR::Classes.new $3
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# RR type, default to A
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@type = Net::DNS::RR::Types.new $4
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# All the rest is data
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@rdata = $5 ? $5.strip : ""
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# All the rest is data
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@rdata = $5 ? $5.strip : ""
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if self.class == Net::DNS::RR
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(eval "Net::DNS::RR::#@type").new(rrstring)
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else
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@ -290,11 +290,11 @@ module Net # :nodoc:
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self.class
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end
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end
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def new_from_hash(args)
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# Name field is mandatory
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unless args.has_key? :name
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# Name field is mandatory
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unless args.has_key? :name
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raise RRArgumentError, "RR argument error: need at least RR name"
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end
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@ -302,7 +302,7 @@ module Net # :nodoc:
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@ttl = args[:ttl] ? args[:ttl].to_i : 10800 # Default 3 hours
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@type = Net::DNS::RR::Types.new args[:type]
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@cls = Net::DNS::RR::Classes.new args[:cls]
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@rdata = args[:rdata] ? args[:rdata].strip : ""
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@rdlength = args[:rdlength] || @rdata.size
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@ -323,6 +323,7 @@ module Net # :nodoc:
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if self.class == Net::DNS::RR
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temp = dn_expand(data,offset)[1]
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type = Net::DNS::RR::Types.new data.unpack("@#{temp} n")[0]
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return unless Net::DNS::RR.const_defined?(type.to_s)
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(eval "Net::DNS::RR::#{type}").parse_packet(data,offset)
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else
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@name,offset = dn_expand(data,offset)
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@ -338,7 +339,7 @@ module Net # :nodoc:
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# rescue StandardError => err
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# raise RRDataError, "Caught exception, maybe packet malformed: #{err}"
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end
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# Methods to be overridden by subclasses
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def subclass_new_from_array(arr)
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end
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@ -369,9 +370,9 @@ module Net # :nodoc:
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return o
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end
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end
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end # class RR
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end # module DNS
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end # module Net
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@ -381,10 +382,10 @@ class RRDataError < StandardError # :nodoc:
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end
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module ExtendHash # :nodoc:
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# Performs a sort of group difference
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# Performs a sort of group difference
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# operation on hashes or arrays
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#
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#
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# a = {:a=>1,:b=>2,:c=>3}
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# b = {:a=>1,:b=>2}
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# c = [:a,:c]
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|
|
|
|||
|
|
@ -296,6 +296,7 @@ class Metasploit3 < Msf::Auxiliary
|
|||
tl << framework.threads.spawn("Module(#{self.refname})-#{ip}", false, ip.dup) do |tip|
|
||||
begin
|
||||
query = @res.query(tip)
|
||||
raise ::Rex::ConnectionError
|
||||
query.each_ptr do |addresstp|
|
||||
print_status("Hostname: #{addresstp} IP address: #{tip.to_s}")
|
||||
report_note(:host => @nsinuse.to_s,
|
||||
|
|
@ -342,12 +343,13 @@ class Metasploit3 < Msf::Auxiliary
|
|||
srvrcd.each do |srvt|
|
||||
trg = "#{srvt}#{dom}"
|
||||
query = @res.query(trg , Net::DNS::SRV)
|
||||
if query
|
||||
query.answer.each do |srv|
|
||||
print_status("SRV Record: #{trg} Host: #{srv.host} Port: #{srv.port} Priority: #{srv.priority}") if srv.type != "CNAME"
|
||||
end
|
||||
next unless query
|
||||
query.answer.each do |srv|
|
||||
next if srv.type == "CNAME"
|
||||
print_status("SRV Record: #{trg} Host: #{srv.host} Port: #{srv.port} Priority: #{srv.priority}")
|
||||
end
|
||||
end
|
||||
print_status("Done")
|
||||
end
|
||||
|
||||
# For Performing Zone Transfers
|
||||
|
|
@ -359,7 +361,7 @@ class Metasploit3 < Msf::Auxiliary
|
|||
end
|
||||
@res.tcp_timeout=15
|
||||
query = @res.query(target, "NS")
|
||||
if (query.answer.length != 0)
|
||||
if query && query.answer.length != 0
|
||||
(query.answer.select { |i| i.class == Net::DNS::RR::NS}).each do |nsrcd|
|
||||
print_status("Testing nameserver: #{nsrcd.nsdname}")
|
||||
nssrvquery = @res.query(nsrcd.nsdname, "A")
|
||||
|
|
@ -372,7 +374,12 @@ class Metasploit3 < Msf::Auxiliary
|
|||
@res.nameserver=(nssrvip)
|
||||
@nsinuse = nssrvip
|
||||
zone = []
|
||||
zone = @res.axfr(target)
|
||||
|
||||
begin
|
||||
zone = @res.axfr(target)
|
||||
rescue ::NoResponseError
|
||||
end
|
||||
|
||||
if zone.length != 0
|
||||
print_status("Zone transfer successful")
|
||||
report_note(:host => nssrvip,
|
||||
|
|
@ -381,7 +388,7 @@ class Metasploit3 < Msf::Auxiliary
|
|||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "Zone transfer successful")
|
||||
:data => zone)
|
||||
# Prints each record according to its type
|
||||
zone.each do |response|
|
||||
response.answer.each do |rr|
|
||||
|
|
@ -389,85 +396,22 @@ class Metasploit3 < Msf::Auxiliary
|
|||
case rr.type
|
||||
when "A"
|
||||
print_status("Name: #{rr.name} IP address: #{rr.address} Record: A ")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.address.to_s},#{rr.name},A")
|
||||
when "SOA"
|
||||
print_status("Name: #{rr.mname} Record: SOA")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.name},SOA")
|
||||
when "MX"
|
||||
print_status("Name: #{rr.exchange} Preference: #{rr.preference} Record: MX")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.exchange},MX")
|
||||
when "CNAME"
|
||||
print_status("Name: #{rr.cname} Record: CNAME")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.cname},CNAME")
|
||||
when "HINFO"
|
||||
print_status("CPU: #{rr.cpu} OS: #{rr.os} Record: HINFO")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "CPU:#{rr.cpu},OS:#{rr.os},HINFO")
|
||||
when "AAAA"
|
||||
print_status("IPv6 Address: #{rr.address} Record: AAAA")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.address.to_s}, AAAA")
|
||||
when "NS"
|
||||
print_status("Name: #{rr.nsdname} Record: NS")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.nsdname},NS")
|
||||
when "TXT"
|
||||
print_status("Text: #{rr.inspect}")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => rr.inspect)
|
||||
when "SRV"
|
||||
print_status("Host: #{rr.host} Port: #{rr.port} Priority: #{rr.priority} Record: SRV")
|
||||
report_note(:host => nssrvip,
|
||||
:proto => 'udp',
|
||||
:sname => 'dns',
|
||||
:port => 53 ,
|
||||
:type => 'dns.enum',
|
||||
:update => :unique_data,
|
||||
:data => "#{rr.host},#{rr.port},#{rr.priority},SRV")
|
||||
end
|
||||
rescue ActiveRecord::RecordInvalid
|
||||
# Do nothing. Probably tried to store :host => 127.0.0.1
|
||||
|
|
|
|||
Loading…
Reference in New Issue