794 lines
18 KiB
Ruby
794 lines
18 KiB
Ruby
# -*- coding: binary -*-
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require 'socket'
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require 'thread'
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require 'resolv'
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require 'rex/exceptions'
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module Rex
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###
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#
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# Base class for all sockets.
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#
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###
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module Socket
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module Comm
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end
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require 'rex/socket/parameters'
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require 'rex/socket/tcp'
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require 'rex/socket/tcp_server'
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require 'rex/socket/comm'
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require 'rex/socket/comm/local'
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require 'rex/socket/switch_board'
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require 'rex/socket/subnet_walker'
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require 'rex/socket/range_walker'
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##
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#
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# Factory methods
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#
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##
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#
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# Create a socket instance using the supplied parameter hash.
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#
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def self.create(opts = {})
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return create_param(Rex::Socket::Parameters.from_hash(opts))
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end
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#
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# Create a socket using the supplied Rex::Socket::Parameter instance.
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#
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def self.create_param(param)
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return param.comm.create(param)
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end
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#
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# Create a TCP socket using the supplied parameter hash.
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#
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def self.create_tcp(opts = {})
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return create_param(Rex::Socket::Parameters.from_hash(opts.merge('Proto' => 'tcp')))
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end
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#
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# Create a TCP server socket using the supplied parameter hash.
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#
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def self.create_tcp_server(opts = {})
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return create_tcp(opts.merge('Server' => true))
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end
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#
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# Create a UDP socket using the supplied parameter hash.
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#
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def self.create_udp(opts = {})
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return create_param(Rex::Socket::Parameters.from_hash(opts.merge('Proto' => 'udp')))
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end
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#
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# Create a IP socket using the supplied parameter hash.
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#
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def self.create_ip(opts = {})
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return create_param(Rex::Socket::Parameters.from_hash(opts.merge('Proto' => 'ip')))
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end
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#
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# Common Regular Expressions
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#
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MATCH_IPV6 = /^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$/
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MATCH_IPV4 = /^\s*(?:(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2}))\s*$/
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MATCH_IPV4_PRIVATE = /^\s*(?:10\.|192\.168|172.(?:1[6-9]|2[0-9]|3[01])\.|169\.254)/
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##
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#
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# Serialization
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#
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##
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# Cache our IPv6 support flag
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@@support_ipv6 = nil
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#
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# Determine whether we support IPv6
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#
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def self.support_ipv6?
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return @@support_ipv6 if not @@support_ipv6.nil?
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@@support_ipv6 = false
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if (::Socket.const_defined?('AF_INET6'))
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begin
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s = ::Socket.new(::Socket::AF_INET6, ::Socket::SOCK_DGRAM, ::Socket::IPPROTO_UDP)
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s.close
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@@support_ipv6 = true
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rescue
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end
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end
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return @@support_ipv6
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end
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#
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# Determine whether this is an IPv4 address
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#
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def self.is_ipv4?(addr)
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( addr =~ MATCH_IPV4 ) ? true : false
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end
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#
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# Determine whether this is an IPv6 address
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#
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def self.is_ipv6?(addr)
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( addr =~ MATCH_IPV6 ) ? true : false
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end
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#
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# Checks to see if the supplied address is in "dotted" form
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#
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def self.dotted_ip?(addr)
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# Match IPv6
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return true if (support_ipv6? and addr =~ MATCH_IPV6)
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# Match IPv4
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return true if (addr =~ MATCH_IPV4)
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false
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end
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#
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# Return true if +addr+ is within the ranges specified in RFC1918, or
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# RFC5735/RFC3927
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#
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def self.is_internal?(addr)
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if self.dotted_ip?(addr)
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addr =~ MATCH_IPV4_PRIVATE
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else
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false
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end
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end
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#
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# Wrapper for Resolv.getaddress that takes special care to see if the
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# supplied address is already a dotted quad, for instance. This is
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# necessary to prevent calls to gethostbyaddr (which occurs on windows).
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# These calls can be quite slow. This also fixes an issue with the
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# Resolv.getaddress() call being non-functional on Ruby 1.9.1 (Win32).
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#
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def self.getaddress(addr, accept_ipv6 = true)
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begin
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if addr =~ MATCH_IPV4 or (accept_ipv6 and addr =~ MATCH_IPV6)
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return addr
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end
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res = ::Socket.gethostbyname(addr)
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return nil if not res
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# Shift the first three elements out
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rname = res.shift
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ralias = res.shift
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rtype = res.shift
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# Rubinius has a bug where gethostbyname returns dotted quads instead of
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# NBO, but that's what we want anyway, so just short-circuit here.
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if res[0] =~ MATCH_IPV4 || res[0] =~ MATCH_IPV6
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res.each { |r|
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# if the caller doesn't mind ipv6, just return whatever we have
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return r if accept_ipv6
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# otherwise, take the first v4 address
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return r if r =~ MATCH_IPV4
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}
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# didn't find one
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return nil
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end
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# Reject IPv6 addresses if we don't accept them
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if not accept_ipv6
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res.reject!{|nbo| nbo.length != 4}
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end
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# Make sure we have at least one name
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return nil if res.length == 0
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# Return the first address of the result
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self.addr_ntoa( res[0] )
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rescue ::ArgumentError # Win32 bug
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nil
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end
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end
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#
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# Wrapper for Resolv.getaddress that takes special care to see if the
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# supplied address is already a dotted quad, for instance. This is
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# necessary to prevent calls to gethostbyaddr (which occurs on windows).
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# These calls can be quite slow. This also fixes an issue with the
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# Resolv.getaddress() call being non-functional on Ruby 1.9.1 (Win32).
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#
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def self.getaddresses(addr, accept_ipv6 = true)
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begin
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if addr =~ MATCH_IPV4 or (accept_ipv6 and addr =~ MATCH_IPV6)
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return [addr]
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end
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res = ::Socket.gethostbyname(addr)
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return [] if not res
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# Shift the first three elements out
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rname = res.shift
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ralias = res.shift
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rtype = res.shift
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# Reject IPv6 addresses if we don't accept them
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if not accept_ipv6
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res.reject!{|nbo| nbo.length != 4}
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end
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# Make sure we have at least one name
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return [] if res.length == 0
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# Return an array of all addresses
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res.map{ |addr| self.addr_ntoa(addr) }
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rescue ::ArgumentError # Win32 bug
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[]
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end
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end
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#
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# Wrapper for Socket.gethostbyname which takes into account whether or not
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# an IP address is supplied. If it is, then reverse DNS resolution does
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# not occur. This is done in order to prevent delays, such as would occur
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# on Windows.
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#
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def self.gethostbyname(host)
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if (is_ipv4?(host))
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return [ host, [], 2, host.split('.').map{ |c| c.to_i }.pack("C4") ]
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end
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if is_ipv6?(host)
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host, scope_id = host.split('%', 2)
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end
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::Socket.gethostbyname(host)
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end
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#
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# Create a sockaddr structure using the supplied IP address, port, and
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# address family
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#
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def self.to_sockaddr(ip, port)
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if (ip == '::ffff:0.0.0.0')
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ip = support_ipv6?() ? '::' : '0.0.0.0'
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end
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return ::Socket.pack_sockaddr_in(port, ip)
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end
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#
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# Returns the address family, host, and port of the supplied sockaddr as
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# [ af, host, port ]
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#
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def self.from_sockaddr(saddr)
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port, host = ::Socket::unpack_sockaddr_in(saddr)
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af = ::Socket::AF_INET
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if (support_ipv6?() and is_ipv6?(host))
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af = ::Socket::AF_INET6
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end
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return [ af, host, port ]
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end
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#
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# Resolves a host to raw network-byte order.
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#
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def self.resolv_nbo(host)
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self.gethostbyname( Rex::Socket.getaddress(host, true) )[3]
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end
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#
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# Resolves a host to raw network-byte order.
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#
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def self.resolv_nbo_list(host)
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Rex::Socket.getaddresses(host).map{|addr| self.gethostbyname(addr)[3] }
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end
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#
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# Resolves a host to a network-byte order ruby integer.
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#
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def self.resolv_nbo_i(host)
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addr_ntoi(resolv_nbo(host))
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end
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#
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# Resolves a host to a list of network-byte order ruby integers.
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#
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def self.resolv_nbo_i_list(host)
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resolv_nbo_list(host).map{|addr| addr_ntoi(addr) }
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end
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#
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# Converts an ASCII IP address to a CIDR mask. Returns
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# nil if it's not convertable.
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#
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def self.addr_atoc(mask)
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mask_i = resolv_nbo_i(mask)
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cidr = nil
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0.upto(32) do |i|
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if ((1 << i)-1) << (32-i) == mask_i
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cidr = i
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break
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end
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end
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return cidr
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end
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#
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# Resolves a CIDR bitmask into a dotted-quad. Returns
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# nil if it's not convertable.
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#
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def self.addr_ctoa(cidr)
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return nil unless (0..32) === cidr.to_i
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addr_itoa(((1 << cidr)-1) << 32-cidr)
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end
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#
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# Resolves a host to a dotted address.
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#
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def self.resolv_to_dotted(host)
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addr_ntoa(addr_aton(host))
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end
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#
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# Converts a ascii address into an integer
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#
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def self.addr_atoi(addr)
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resolv_nbo_i(addr)
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end
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#
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# Converts a ascii address into a list of addresses
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#
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def self.addr_atoi_list(addr)
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resolv_nbo_i_list(addr)
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end
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#
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# Converts an integer address into ascii
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#
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def self.addr_itoa(addr, v6=false)
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nboa = addr_iton(addr, v6)
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# IPv4
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if (addr < 0x100000000 and not v6)
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addr_ntoa(nboa)
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# IPv6
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else
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addr_ntoa(nboa)
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end
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end
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#
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# Converts a ascii address to network byte order
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#
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def self.addr_aton(addr)
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resolv_nbo(addr)
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end
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#
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# Converts a network byte order address to ascii
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#
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def self.addr_ntoa(addr)
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# IPv4
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if (addr.length == 4)
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return addr.unpack('C4').join('.')
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end
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# IPv6
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if (addr.length == 16)
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return compress_address(addr.unpack('n8').map{ |c| "%x" % c }.join(":"))
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end
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raise RuntimeError, "Invalid address format"
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end
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#
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# Implement zero compression for IPv6 addresses.
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# Uses the compression method from Marco Ceresa's IPAddress GEM
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# https://github.com/bluemonk/ipaddress/blob/master/lib/ipaddress/ipv6.rb
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#
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def self.compress_address(addr)
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return addr unless is_ipv6?(addr)
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addr = addr.dup
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while true
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break if addr.sub!(/\A0:0:0:0:0:0:0:0\Z/, '::')
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break if addr.sub!(/\b0:0:0:0:0:0:0\b/, ':')
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break if addr.sub!(/\b0:0:0:0:0:0\b/, ':')
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break if addr.sub!(/\b0:0:0:0:0\b/, ':')
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break if addr.sub!(/\b0:0:0:0\b/, ':')
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break if addr.sub!(/\b0:0:0\b/, ':')
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break if addr.sub!(/\b0:0\b/, ':')
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break
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end
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addr.sub(/:{3,}/, '::')
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end
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#
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# Converts a network byte order address to an integer
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#
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def self.addr_ntoi(addr)
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bits = addr.unpack("N*")
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if (bits.length == 1)
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return bits[0]
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end
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if (bits.length == 4)
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val = 0
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bits.each_index { |i| val += ( bits[i] << (96 - (i * 32)) ) }
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return val
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end
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raise RuntimeError, "Invalid address format"
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end
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#
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# Converts an integer into a network byte order address
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#
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def self.addr_iton(addr, v6=false)
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if(addr < 0x100000000 and not v6)
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return [addr].pack('N')
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else
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w = []
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w[0] = (addr >> 96) & 0xffffffff
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w[1] = (addr >> 64) & 0xffffffff
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w[2] = (addr >> 32) & 0xffffffff
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w[3] = addr & 0xffffffff
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return w.pack('N4')
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end
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end
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#
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# Converts a CIDR subnet into an array (base, bcast)
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#
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def self.cidr_crack(cidr, v6=false)
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tmp = cidr.split('/')
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tst,scope = tmp[0].split("%",2)
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scope = "%" + scope if scope
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scope ||= ""
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addr = addr_atoi(tst)
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bits = 32
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mask = 0
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use6 = false
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if (addr > 0xffffffff or v6 or cidr =~ /:/)
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use6 = true
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bits = 128
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end
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mask = (2 ** bits) - (2 ** (bits - tmp[1].to_i))
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base = addr & mask
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stop = base + (2 ** (bits - tmp[1].to_i)) - 1
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return [self.addr_itoa(base, use6) + scope, self.addr_itoa(stop, use6) + scope]
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end
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#
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# Converts a netmask (255.255.255.240) into a bitmask (28). This is the
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# lame kid way of doing it.
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#
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def self.net2bitmask(netmask)
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nmask = resolv_nbo(netmask)
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imask = addr_ntoi(nmask)
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bits = 32
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if (imask > 0xffffffff)
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bits = 128
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end
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0.upto(bits-1) do |bit|
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p = 2 ** bit
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return (bits - bit) if ((imask & p) == p)
|
|
end
|
|
|
|
0
|
|
end
|
|
|
|
#
|
|
# Converts a bitmask (28) into a netmask (255.255.255.240)
|
|
#
|
|
def self.bit2netmask(bitmask, ipv6=false)
|
|
if bitmask > 32 or ipv6
|
|
i = ((~((2 ** (128 - bitmask)) - 1)) & (2**128-1))
|
|
n = Rex::Socket.addr_iton(i, true)
|
|
return Rex::Socket.addr_ntoa(n)
|
|
else
|
|
[ (~((2 ** (32 - bitmask)) - 1)) & 0xffffffff ].pack('N').unpack('CCCC').join('.')
|
|
end
|
|
end
|
|
|
|
|
|
def self.portspec_crack(pspec)
|
|
portspec_to_portlist(pspec)
|
|
end
|
|
|
|
#
|
|
# Converts a port specification like "80,21-23,443" into a sorted,
|
|
# unique array of valid port numbers like [21,22,23,80,443]
|
|
#
|
|
def self.portspec_to_portlist(pspec)
|
|
ports = []
|
|
|
|
# Build ports array from port specification
|
|
pspec.split(/,/).each do |item|
|
|
start, stop = item.split(/-/).map { |p| p.to_i }
|
|
|
|
start ||= 0
|
|
stop ||= item.match(/-/) ? 65535 : start
|
|
|
|
start, stop = stop, start if stop < start
|
|
|
|
start.upto(stop) { |p| ports << p }
|
|
end
|
|
|
|
# Sort, and remove dups and invalid ports
|
|
ports.sort.uniq.delete_if { |p| p < 1 or p > 65535 }
|
|
end
|
|
|
|
#
|
|
# Converts a port list like [1,2,3,4,5,100] into a
|
|
# range specification like "1-5,100"
|
|
#
|
|
def self.portlist_to_portspec(parr)
|
|
ranges = []
|
|
range = []
|
|
lastp = nil
|
|
|
|
parr.uniq.sort{|a,b| a<=>b}.map{|a| a.to_i}.each do |n|
|
|
next if (n < 1 or n > 65535)
|
|
if not lastp
|
|
range = [n]
|
|
lastp = n
|
|
next
|
|
end
|
|
|
|
if lastp == n - 1
|
|
range << n
|
|
else
|
|
ranges << range
|
|
range = [n]
|
|
end
|
|
lastp = n
|
|
end
|
|
|
|
ranges << range
|
|
ranges.delete(nil)
|
|
ranges.uniq.map{|x| x.length == 1 ? "#{x[0]}" : "#{x[0]}-#{x[-1]}"}.join(",")
|
|
end
|
|
|
|
##
|
|
#
|
|
# Utility class methods
|
|
#
|
|
##
|
|
|
|
#
|
|
# This method does NOT send any traffic to the destination, instead, it uses a
|
|
# "bound" UDP socket to determine what source address we would use to
|
|
# communicate with the specified destination. The destination defaults to
|
|
# Google's DNS server to make the standard behavior determine which IP
|
|
# we would use to communicate with the internet.
|
|
#
|
|
def self.source_address(dest='8.8.8.8', comm = ::Rex::Socket::Comm::Local)
|
|
begin
|
|
s = self.create_udp(
|
|
'PeerHost' => dest,
|
|
'PeerPort' => 31337,
|
|
'Comm' => comm
|
|
)
|
|
r = s.getsockname[1]
|
|
s.close
|
|
|
|
# Trim off the trailing interface ID for link-local IPv6
|
|
return r.split('%').first
|
|
rescue ::Exception
|
|
return '127.0.0.1'
|
|
end
|
|
end
|
|
|
|
#
|
|
# Identifies the link-local address of a given interface (if IPv6 is enabled)
|
|
#
|
|
def self.ipv6_link_address(intf)
|
|
r = source_address("FF02::1%#{intf}")
|
|
return if not (r and r =~ /^fe80/i)
|
|
r
|
|
end
|
|
|
|
#
|
|
# Identifies the mac address of a given interface (if IPv6 is enabled)
|
|
#
|
|
def self.ipv6_mac(intf)
|
|
r = ipv6_link_address(intf)
|
|
return if not r
|
|
raw = addr_aton(r)[-8, 8]
|
|
(raw[0,3] + raw[5,3]).unpack("C*").map{|c| "%.2x" % c}.join(":")
|
|
end
|
|
|
|
#
|
|
# Create a TCP socket pair.
|
|
#
|
|
# sf: This create a socket pair using native ruby sockets and will work
|
|
# on Windows where ::Socket.pair is not implemented.
|
|
# Note: OpenSSL requires native ruby sockets for its io.
|
|
#
|
|
# Note: Even though sub-threads are smashing the parent threads local, there
|
|
# is no concurrent use of the same locals and this is safe.
|
|
def self.tcp_socket_pair
|
|
lsock = nil
|
|
rsock = nil
|
|
laddr = '127.0.0.1'
|
|
lport = 0
|
|
threads = []
|
|
mutex = ::Mutex.new
|
|
|
|
threads << Rex::ThreadFactory.spawn('TcpSocketPair', false) {
|
|
server = nil
|
|
mutex.synchronize {
|
|
threads << Rex::ThreadFactory.spawn('TcpSocketPairClient', false) {
|
|
mutex.synchronize {
|
|
rsock = ::TCPSocket.new( laddr, lport )
|
|
}
|
|
}
|
|
server = ::TCPServer.new(laddr, 0)
|
|
if (server.getsockname =~ /127\.0\.0\.1:/)
|
|
# JRuby ridiculousness
|
|
caddr, lport = server.getsockname.split(":")
|
|
caddr = caddr[1,caddr.length]
|
|
lport = lport.to_i
|
|
else
|
|
# Sane implementations where Socket#getsockname returns a
|
|
# sockaddr
|
|
lport, caddr = ::Socket.unpack_sockaddr_in( server.getsockname )
|
|
end
|
|
}
|
|
lsock, saddr = server.accept
|
|
server.close
|
|
}
|
|
|
|
threads.each { |t| t.join }
|
|
|
|
return [lsock, rsock]
|
|
end
|
|
|
|
#
|
|
# Create a UDP socket pair using native ruby UDP sockets.
|
|
#
|
|
def self.udp_socket_pair
|
|
laddr = '127.0.0.1'
|
|
|
|
lsock = ::UDPSocket.new
|
|
lsock.bind( laddr, 0 )
|
|
|
|
rsock = ::UDPSocket.new
|
|
rsock.bind( laddr, 0 )
|
|
|
|
rsock.connect( *lsock.addr.values_at(3,1) )
|
|
|
|
lsock.connect( *rsock.addr.values_at(3,1) )
|
|
|
|
return [lsock, rsock]
|
|
end
|
|
|
|
|
|
##
|
|
#
|
|
# Class initialization
|
|
#
|
|
##
|
|
|
|
#
|
|
# Initialize general socket parameters.
|
|
#
|
|
def initsock(params = nil)
|
|
if (params)
|
|
self.peerhost = params.peerhost
|
|
self.peerport = params.peerport
|
|
self.localhost = params.localhost
|
|
self.localport = params.localport
|
|
self.context = params.context || {}
|
|
self.ipv = params.v6 ? 6 : 4
|
|
end
|
|
end
|
|
|
|
#
|
|
# By default, all sockets are themselves selectable file descriptors.
|
|
#
|
|
def fd
|
|
self
|
|
end
|
|
|
|
#
|
|
# Returns local connection information.
|
|
#
|
|
def getsockname
|
|
Socket.from_sockaddr(super)
|
|
end
|
|
|
|
#
|
|
# Wrapper around getsockname
|
|
#
|
|
def getlocalname
|
|
getsockname
|
|
end
|
|
|
|
#
|
|
# Return peer connection information.
|
|
#
|
|
def getpeername
|
|
return Socket.from_sockaddr(super)
|
|
end
|
|
|
|
#
|
|
# Returns a string that indicates the type of the socket, such as 'tcp'.
|
|
#
|
|
def type?
|
|
raise NotImplementedError, "Socket type is not supported."
|
|
end
|
|
|
|
#
|
|
# The peer host of the connected socket.
|
|
#
|
|
attr_reader :peerhost
|
|
#
|
|
# The peer port of the connected socket.
|
|
#
|
|
attr_reader :peerport
|
|
#
|
|
# The local host of the connected socket.
|
|
#
|
|
attr_reader :localhost
|
|
#
|
|
# The local port of the connected socket.
|
|
#
|
|
attr_reader :localport
|
|
#
|
|
# The IP version of the socket
|
|
#
|
|
attr_reader :ipv
|
|
#
|
|
# Contextual information that describes the source and other
|
|
# instance-specific attributes. This comes from the param.context
|
|
# attribute.
|
|
#
|
|
attr_reader :context
|
|
|
|
protected
|
|
|
|
attr_writer :peerhost, :peerport, :localhost, :localport # :nodoc:
|
|
attr_writer :context # :nodoc:
|
|
attr_writer :ipv # :nodoc:
|
|
|
|
end
|
|
|
|
end
|
|
|
|
#
|
|
# Globalized socket constants
|
|
#
|
|
SHUT_RDWR = ::Socket::SHUT_RDWR
|
|
SHUT_RD = ::Socket::SHUT_RD
|
|
SHUT_WR = ::Socket::SHUT_WR
|
|
|