320 lines
7.9 KiB
Ruby
320 lines
7.9 KiB
Ruby
require 'singleton'
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require 'rex/socket'
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require 'rex/socket/tcp'
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require 'rex/socket/ssl_tcp'
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require 'rex/socket/ssl_tcp_server'
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require 'rex/socket/udp'
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require 'rex/socket/ip'
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require 'timeout'
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###
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#
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# Local communication class factory.
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#
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###
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class Rex::Socket::Comm::Local
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include Singleton
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include Rex::Socket::Comm
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#
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# Creates an instance of a socket using the supplied parameters.
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#
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def self.create(param)
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case param.proto
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when 'tcp'
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return create_by_type(param, ::Socket::SOCK_STREAM, ::Socket::IPPROTO_TCP)
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when 'udp'
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return create_by_type(param, ::Socket::SOCK_DGRAM, ::Socket::IPPROTO_UDP)
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when 'ip'
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return create_ip(param)
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else
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raise Rex::UnsupportedProtocol.new(param.proto), caller
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end
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end
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#
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# Creates a raw IP socket using the supplied Parameter instance.
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# Special-cased because of how different it is from UDP/TCP
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#
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def self.create_ip(param)
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sock = ::Socket.open(::Socket::PF_INET, ::Socket::SOCK_RAW, ::Socket::IPPROTO_RAW)
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sock.setsockopt(::Socket::IPPROTO_IP, ::Socket::IP_HDRINCL, 1)
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return sock if (param.bare?)
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sock.extend(::Rex::Socket::Ip)
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sock.initsock(param)
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sock
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end
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#
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# Creates a socket using the supplied Parameter instance.
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#
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def self.create_by_type(param, type, proto = 0)
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# Whether to use IPv6 addressing
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usev6 = false
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# Detect IPv6 addresses and enable IPv6 accordingly
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if ( Rex::Socket.support_ipv6?())
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# Allow the caller to force IPv6
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if (param.v6)
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usev6 = true
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end
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# Force IPv6 mode for non-connected UDP sockets
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if (type == ::Socket::SOCK_DGRAM and not param.peerhost)
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# FreeBSD allows IPv6 socket creation, but throws an error on sendto()
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if (not Rex::Compat.is_freebsd())
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usev6 = true
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end
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end
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local = Rex::Socket.resolv_nbo(param.localhost) if param.localhost
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peer = Rex::Socket.resolv_nbo(param.peerhost) if param.peerhost
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if (local and local.length == 16)
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usev6 = true
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end
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if (peer and peer.length == 16)
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usev6 = true
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end
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if (usev6)
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if (local and local.length == 4)
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if (local == "\x00\x00\x00\x00")
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param.localhost = '::'
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else
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param.localhost = '::ffff:' + Rex::Socket.getaddress(param.localhost)
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end
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end
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if (peer and peer.length == 4)
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if (peer == "\x00\x00\x00\x00")
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param.peerhost = '::'
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else
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param.peerhost = '::ffff:' + Rex::Socket.getaddress(param.peerhost)
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end
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end
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param.v6 = true
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end
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else
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# No IPv6 support
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param.v6 = false
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end
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# Notify handlers of the before socket create event.
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self.instance.notify_before_socket_create(self, param)
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# Create the socket
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sock = nil
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if (param.v6)
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sock = ::Socket.new(::Socket::AF_INET6, type, proto)
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else
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sock = ::Socket.new(::Socket::AF_INET, type, proto)
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end
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# Bind to a given local address and/or port if they are supplied
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if (param.localhost || param.localport)
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begin
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sock.setsockopt(::Socket::SOL_SOCKET, ::Socket::SO_REUSEADDR, true)
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sock.bind(Rex::Socket.to_sockaddr(param.localhost, param.localport))
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rescue Errno::EADDRINUSE
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sock.close
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raise Rex::AddressInUse.new(param.localhost, param.localport), caller
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end
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end
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# If a server TCP instance is being created...
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if (param.server?)
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sock.listen(32)
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return sock if (param.bare?)
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klass = Rex::Socket::TcpServer
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if (param.ssl)
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klass = Rex::Socket::SslTcpServer
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end
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sock.extend(klass)
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sock.initsock(param)
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# Otherwise, if we're creating a client...
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else
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chain = []
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# If we were supplied with host information
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if (param.peerhost)
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begin
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if param.proxies
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chain = param.proxies.dup
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chain.push(['host',param.peerhost,param.peerport])
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ip = chain[0][1]
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port = chain[0][2].to_i
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begin
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timeout(param.timeout) do
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sock.connect(Rex::Socket.to_sockaddr(ip, port))
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end
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rescue ::Timeout::Error
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raise ::Errno::ETIMEDOUT
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end
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else
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begin
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timeout(param.timeout) do
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sock.connect(Rex::Socket.to_sockaddr(param.peerhost, param.peerport))
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end
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rescue ::Timeout::Error
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raise ::Errno::ETIMEDOUT
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end
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end
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rescue ::Errno::EHOSTUNREACH,::Errno::ENETDOWN,::Errno::ENETUNREACH,::Errno::ENETRESET,::Errno::EHOSTDOWN,::Errno::EACCES,::Errno::EINVAL,::Errno::EADDRNOTAVAIL
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sock.close
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raise Rex::HostUnreachable.new(param.peerhost, param.peerport), caller
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rescue Errno::ETIMEDOUT
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sock.close
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raise Rex::ConnectionTimeout.new(param.peerhost, param.peerport), caller
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rescue ::Errno::ECONNRESET,::Errno::ECONNREFUSED,::Errno::ENOTCONN,::Errno::ECONNABORTED
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sock.close
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raise Rex::ConnectionRefused.new(param.peerhost, param.peerport), caller
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end
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end
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if (param.bare? == false)
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case param.proto
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when 'tcp'
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klass = Rex::Socket::Tcp
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if (param.ssl)
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klass = Rex::Socket::SslTcp
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end
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sock.extend(klass)
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sock.initsock(param)
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when 'udp'
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sock.extend(Rex::Socket::Udp)
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sock.initsock(param)
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end
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end
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if chain.size > 1
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chain.each_with_index {
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|proxy, i|
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next_hop = chain[i + 1]
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if next_hop
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proxy(sock, proxy[0], next_hop[1], next_hop[2])
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end
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}
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end
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end
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# Notify handlers that a socket has been created.
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self.instance.notify_socket_created(self, sock, param)
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sock
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end
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def self.proxy (sock, type, host, port)
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#$stdout.print("PROXY\n")
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case type.downcase
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when 'socks4'
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setup = [4,1,port.to_i].pack('CCn') + Socket.gethostbyname(host)[3] + Rex::Text.rand_text_alpha(rand(8)+1) + "\x00"
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size = sock.put(setup)
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if (size != setup.length)
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raise ArgumentError, "Wrote less data than expected to the socks4 proxy"
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end
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begin
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ret = sock.get_once(8, 30)
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rescue IOError
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raise Rex::ConnectionRefused.new(host, port), caller
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end
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if (ret.nil? or ret.length < 8)
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raise ArgumentError, 'SOCKS4 server did not respond with a proper response'
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end
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if ret[1] != 90
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raise "SOCKS4 server responded with error code #{ret[0]}"
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end
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when 'socks5'
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auth_methods = [5,1,0].pack('CCC')
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size = sock.put(auth_methods)
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if (size != auth_methods.length)
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raise ArgumentError, "Wrote less data than expected to the socks5 proxy"
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end
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response = sock.get_once(2,30)
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if (0xff == response[1,1])
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raise ArgumentError, "Proxy requires authentication"
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end
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if (Rex::Socket.is_ipv4?(host))
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addr = Rex::Socket.gethostbyname(host)[3]
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setup = [5,1,0,1].pack('C4') + addr + [port.to_i].pack('n')
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elsif (Rex::Socket.support_ipv6? and Rex::Socket.is_ipv6?(host))
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# IPv6 stuff all untested
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addr = Rex::Socket.gethostbyname(host)[3]
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setup = [5,1,0,4].pack('C4') + addr + [port.to_i].pack('n')
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else
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# Then it must be a domain name.
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# Unfortunately, it looks like the host has always been
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# resolved by the time it gets here, so this code never runs.
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setup = [5,1,0,3].pack('C4') + [host.length].pack('C') + host + [port.to_i].pack('n')
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end
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size = sock.put(setup)
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if (size != setup.length)
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raise ArgumentError, "Wrote less data than expected to the socks5 proxy"
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end
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begin
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response = sock.get_once(10, 30)
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rescue IOError
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raise Rex::ConnectionRefused.new(host, port), caller
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end
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if (response.nil? or response.length < 10)
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raise ArgumentError, 'SOCKS5 server did not respond with a proper response'
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end
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if response[1] != 0
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raise "SOCKS5 server responded with error code #{response[1]}"
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end
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else
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raise ArgumentError, 'Unsupported proxy type and/or version', caller
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end
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end
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##
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#
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# Registration
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#
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##
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def self.register_event_handler(handler) # :nodoc:
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self.instance.register_event_handler(handler)
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end
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def self.deregister_event_handler(handler) # :nodoc:
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self.instance.deregister_event_handler(handler)
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end
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def self.each_event_handler(handler) # :nodoc:
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self.instance.each_event_handler(handler)
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end
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end
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