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metasploit-framework/lib/packetfu/packet.rb

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Fixes #3348. Adds the PacketFu packet processing library from http://code.google.com/p/packetfu/ , and adds a db_import path for pcaps (it's straightforward -- db_import /path/to/file.pcap will import hosts and service ports from a pcap file.) git-svn-id: file:///home/svn/framework3/trunk@11308 4d416f70-5f16-0410-b530-b9f4589650da
2010-12-12 17:44:48 +00:00
module PacketFu
# Packet is the parent class of EthPacket, IPPacket, UDPPacket, TCPPacket, and all
# other packets.
class Packet
attr_reader :flavor # Packet Headers are responsible for their own specific flavor methods.
attr_accessor :headers # All packets have a header collection, useful for determining protocol trees.
attr_accessor :iface # Default inferface to send packets to
# Force strings into binary.
def self.force_binary(str)
str.force_encoding "binary" if str.respond_to? :force_encoding
end
# Parse() creates the correct packet type based on the data, and returns the apporpiate
# Packet subclass.
#
# There is an assumption here that all incoming packets are either EthPacket
# or InvalidPacket types.
#
# New packet types should get an entry here.
def self.parse(packet,args={})
force_binary(packet)
if packet.size >= 14 # Min size for Ethernet. No check for max size, yet.
case packet[12,2] # Check the Eth protocol field.
when "\x08\x00" # It's IP.
if 1.respond_to? :ord
ipv = packet[14,1][0].ord >> 4
else
ipv = packet[14,1][0] >> 4
end
case ipv # Check the IP version field.
when 4; # It's IPv4.
case packet[23,1] # Check the IP protocol field.
when "\x06"; p = TCPPacket.new # Returns a TCPPacket.
when "\x11"; p = UDPPacket.new # Returns a UDPPacket.
when "\x01"; p = ICMPPacket.new # Returns an ICMPPacket.
else; p = IPPacket.new # Returns an IPPacket since we can't tell the transport layer.
end
else; p = IPPacket.new # Returns an EthPacket since we don't know any other IP version.
end
when "\x08\x06" # It's arp
if packet.size >= 28 # Min size for complete arp
p = ARPPacket.new
else; p = EthPacket.new # Returns an EthPacket since we can't deal with tiny arps.
end
when "\x86\xdd" # It's IPv6
if packet.size >= 54 # Min size for a complete IPv6 packet.
p = IPv6Packet.new
else; p = EthPacket.new # Returns an EthPacket since we can't deal with tiny Ipv6.
end
else; p = EthPacket.new # Returns an EthPacket since we can't tell the network layer.
end
else
p = InvalidPacket.new # Not the right size for Ethernet (jumbo frames are okay)
end
parsed_packet = p.read(packet,args)
return parsed_packet
end
#method_missing() delegates protocol-specific field actions to the apporpraite
#class variable (which contains the associated packet type)
#This register-of-protocols style switch will work for the
#forseeable future (there aren't /that/ many packet types), and it's a handy
#way to know at a glance what packet types are supported.
def method_missing(sym, *args, &block)
case sym.to_s
when /^invalid_/
@invalid_header.send(sym,*args)
when /^eth_/
@eth_header.send(sym,*args)
when /^arp_/
@arp_header.send(sym,*args)
when /^ip_/
@ip_header.send(sym,*args)
when /^icmp_/
@icmp_header.send(sym,*args)
when /^udp_/
@udp_header.send(sym,*args)
when /^tcp_/
@tcp_header.send(sym,*args)
when /^ipv6_/
@ipv6_header.send(sym,*args)
else
raise NoMethodError, "Unknown method `#{sym}' for this packet object."
end
end
def respond_to?(sym, include_private = false)
if sym.to_s =~ /^(invalid|eth|arp|ip|icmp|udp|tcp|ipv6)_/
self.instance_variable_get("@#{$1}_header").respond_to? sym
else
super
end
end
# Get the binary string of the entire packet.
def to_s
@headers[0].to_s
end
# In the event of no proper decoding, at least send it to the inner-most header.
def write(io)
@headers[0].write(io)
end
# Get the outermost payload (body) of the packet; this is why all packet headers
# should have a body type.
def payload
@headers.last.body
end
# Set the outermost payload (body) of the packet.
def payload=(args)
@headers.last.body=(args)
end
# Converts a packet to libpcap format. Bit of a hack?
def to_pcap(args={})
p = PcapPacket.new(:endian => args[:endian],
:timestamp => Timestamp.new.to_s,
:incl_len => self.to_s.size,
:orig_len => self.to_s.size,
:data => self)
end
# Put the entire packet into a libpcap file. XXX: this is a
# hack for now just to confirm that packets are getting created
# correctly. Now with append! XXX: Document this!
def to_f(filename=nil,mode='w')
filename ||= 'out.pcap'
mode = mode.to_s[0,1] + "b"
raise ArgumentError, "Unknown mode: #{mode.to_s}" unless mode =~ /^[wa]/
if(mode == 'w' || !(File.exists?(filename)))
data = [PcapHeader.new, self.to_pcap].map {|x| x.to_s}.join
else
data = self.to_pcap
end
File.open(filename, mode) {|f| f.write data}
return [filename, 1, data.size]
end
# Put the entire packet on the wire by creating a temporary PacketFu::Inject object.
# TODO: Do something with auto-checksumming?
def to_w(iface=nil)
iface = iface || self.iface || PacketFu::Config.new.config[:iface]
inj = PacketFu::Inject.new(:iface => iface)
inj.array = [@headers[0].to_s]
inj.inject
end
# Recalculates all the calcuated fields for all headers in the packet.
# This is important since read() wipes out all the calculated fields
# such as length and checksum and what all.
def recalc(arg=:all)
case arg
when :ip
ip_recalc(:all)
when :icmp
icmp_recalc(:all)
when :udp
udp_recalc(:all)
when :tcp
tcp_recalc(:all)
when :all
ip_recalc(:all) if @ip_header
icmp_recalc(:all) if @icmp_header
udp_recalc(:all) if @udp_header
tcp_recalc(:all) if @tcp_header
else
raise ArgumentError, "Recalculating `#{arg}' unsupported. Try :all"
end
@headers[0]
end
# Read() takes (and trusts) the io input and shoves it all into a well-formed Packet.
# Note that read is a destructive process, so any existing data will be lost.
#
# TODO: This giant if tree is a mess, and worse, is decieving. You need to define
# actions both here and in parse(). All read() does is make a (good) guess as to
# what @headers to expect, and reads data to them.
#
# To take strings and turn them into packets without knowing ahead of time what kind of
# packet it is, use Packet.parse instead; parse() handles the figuring-out part.
#
# A note on the :strip => true argument: If :strip is set, defined lengths of data will
# be believed, and any trailers (such as frame check sequences) will be chopped off. This
# helps to ensure well-formed packets, at the cost of losing perhaps important FCS data.
#
# If :strip is false, header lengths are /not/ believed, and all data will be piped in.
# When capturing from the wire, this is usually fine, but recalculating the length before
# saving or re-transmitting will absolutely change the data payload; FCS data will become
# part of the TCP data as far as tcp_len is concerned. Some effort has been made to preserve
# the "real" payload for the purposes of checksums, but currently, it's impossible to seperate
# new payload data from old trailers, so things like pkt.payload += "some data" will not work
# correctly.
#
# So, to summarize; if you intend to alter the data, use :strip. If you don't, don't. Also,
# this is a horrid XXX hack. Stripping is useful (and fun!), but the default behavior really
# should be to create payloads correctly, and /not/ treat extra FCS data as a payload.
#
# Update: This scheme is so lame. Need to fix. Seriously.
# Update: still sucks. Really.
def read(io,args={})
begin
if io.size >= 14
@eth_header.read(io)
eth_proto_num = io[12,2].unpack("n")[0]
if eth_proto_num == 0x0800 # It's IP.
if 1.respond_to? :ord
ipv = io[14].ord
else
ipv = io[14]
end
ip_hlen=(ipv & 0x0f) * 4
ip_ver=(ipv >> 4) # It's IPv4. Other versions, all bets are off!
if ip_ver == 4
ip_proto_num = io[23,1].unpack("C")[0]
@ip_header.read(io[14,ip_hlen])
if ip_proto_num == 0x06 # It's TCP.
tcp_len = io[16,2].unpack("n")[0] - 20
if args[:strip] # Drops trailers like frame check sequence (FCS). Often desired for cleaner packets.
tcp_all = io[ip_hlen+14,tcp_len] # Believe the tcp_len value; chop off anything that's not in range.
else
tcp_all = io[ip_hlen+14,0xffff] # Don't believe the tcp_len value; suck everything up.
end
tcp_hlen = ((tcp_all[12,1].unpack("C")[0]) >> 4) * 4
if tcp_hlen.to_i >= 20
@tcp_header.read(tcp_all)
@ip_header.body = @tcp_header
else # It's a TCP packet with an impossibly small hlen, so it can't be real TCP. Abort! Abort!
@ip_header.body = io[16,io.size-16]
end
elsif ip_proto_num == 0x11 # It's UDP.
udp_len = io[16,2].unpack("n")[0] - 20
if args[:strip] # Same deal as with TCP. We might have stuff at the end of the packet that's not part of the payload.
@udp_header.read(io[ip_hlen+14,udp_len])
else # ... Suck it all up. BTW, this will change the lengths if they are ever recalc'ed. Bummer.
@udp_header.read(io[ip_hlen+14,0xffff])
end
@ip_header.body = @udp_header
elsif ip_proto_num == 1 # It's ICMP
@icmp_header.read(io[ip_hlen+14,0xffff])
@ip_header.body = @icmp_header
else # It's an IP packet for a protocol we don't have a decoder for.
@ip_header.body = io[16,io.size-16]
end
else # It's not IPv4, so no idea what should come next. Just dump it all into an ip_header and ip payload.
@ip_header.read(io[14,ip_hlen])
@ip_header.body = io[16,io.size-16]
end
@eth_header.body = @ip_header
elsif eth_proto_num == 0x0806 # It's ARP
@arp_header.read(io[14,0xffff]) # You'll nearly have a trailer and you'll never know what size.
@eth_header.body=@arp_header
@eth_header.body
elsif eth_proto_num == 0x86dd # It's IPv6
@ipv6_header.read(io[14,0xffff])
@eth_header.body=@ipv6_header
else # It's an Ethernet packet for a protocol we don't have a decoder for
@eth_header.body = io[14,io.size-14]
end
if (args[:fix] || args[:recalc])
# Unfortunately, we cannot simply recalc with abandon, since
# we may have unaccounted trailers that will sneak into the checksum.
# The better way to handle this is to put trailers in their own
# StructFu field, but I'm not a-gonna right now. :/
ip_recalc(:ip_sum) if respond_to? :ip_header
recalc(:tcp) if respond_to? :tcp_header
recalc(:udp) if respond_to? :udp_header
end
else # You're not big enough for Ethernet.
@invalid_header.read(io)
end
# @headers[0]
self
rescue ::Exception => e
# remove last header
# nested_types = self.headers.collect {|header| header.class}
# nested_types.pop # whatever this packet type is, we weren't able to parse it
self.headers.pop
return_header_type = self.headers[self.headers.length-1].class.to_s
retklass = PacketFu::InvalidPacket
seekpos = 0
target_header = @invalid_header
case return_header_type.to_s
when "PacketFu::EthHeader"
retklass = PacketFu::EthPacket
seekpos = 0x0e
target_header = @eth_header
when "PacketFu::IPHeader"
retklass = PacketFu::IPPacket
seekpos = 0x0e + @ip_header.ip_hl * 4
target_header = @ip_header
when "PacketFu::TCPHeader"
retklass = PacketFu::TCPPacket
seekpos = 0x0e + @ip_header.ip_hl * 4 + @tcpheader.tcp_hlen
target_header = @tcp_header
when "PacketFu::UDPHeader"
retklass = PacketFu::UDPPacket
when "PacketFu::ARPHeader"
retklass = PacketFu::ARPPacket
when "PacketFu::ICMPHeader"
retklass = PacketFu::ICMPPacket
when "PacketFu::IPv6Header"
retklass = PacketFu::IPv6Packet
else
end
io = io[seekpos,io.length - seekpos]
target_header.body = io
p = retklass.new
p.headers = self.headers
p
raise e if $debug
end
end
# Peek provides summary data on packet contents.
# Each packet type should provide its own peek method, and shouldn't exceed 80 characters wide (for
# easy reading in normal irb shells). If they don't, this default summary will step in.
def peek(args={})
peek_data = ["? "]
peek_data << "%-5d" % self.to_s.size
peek_data << "%68s" % self.to_s[0,34].unpack("H*")[0]
peek_data.join
end
# Hexify provides a neatly-formatted dump of binary data, familar to hex readers.
def hexify(str)
hexascii_lines = str.to_s.unpack("H*")[0].scan(/.{1,32}/)
chars = str.to_s.gsub(/[\x00-\x1f\x7f-\xff]/,'.')
chars_lines = chars.scan(/.{1,16}/)
ret = []
hexascii_lines.size.times {|i| ret << "%-48s %s" % [hexascii_lines[i].gsub(/(.{2})/,"\\1 "),chars_lines[i]]}
ret.join("\n")
end
# Returns a hex-formatted representation of the packet.
#
# ==== Arguments
#
# 0..9 : If a number is given only the layer in @header[arg] will be displayed. Note that this will include all @headers included in that header.
# :layers : If :layers is specified, the dump will return an array of headers by layer level.
# :all : An alias for arg=0.
#
# ==== Examples
#
# irb(main):003:0> pkt = TCPPacket.new
# irb(main):003:0> puts pkt.inspect_hex(:layers)
# 00 1a c5 00 00 00 00 1a c5 00 00 00 08 00 45 00 ..............E.
# 00 28 83 ce 00 00 ff 06 38 02 00 00 00 00 00 00 .(......8.......
# 00 00 a6 0f 00 00 ac 89 7b 26 00 00 00 00 50 00 ........{&....P.
# 40 00 a2 25 00 00 @..%..
# 45 00 00 28 83 ce 00 00 ff 06 38 02 00 00 00 00 E..(......8.....
# 00 00 00 00 a6 0f 00 00 ac 89 7b 26 00 00 00 00 ..........{&....
# 50 00 40 00 a2 25 00 00 P.@..%..
# a6 0f 00 00 ac 89 7b 26 00 00 00 00 50 00 40 00 ......{&....P.@.
# a2 25 00 00 .%..
# => nil
# irb(main):004:0> puts pkt.inspect_hex(:layers)[2]
# a6 0f 00 00 ac 89 7b 26 00 00 00 00 50 00 40 00 ......{&....P.@.
# a2 25 00 00 .%..
# => nil
#
# TODO: Colorize this! Everyone loves colorized irb output.
def inspect_hex(arg=0)
case arg
when :layers
ret = []
@headers.size.times do |i|
ret << hexify(@headers[i])
end
ret
when (0..9)
if @headers[arg]
hexify(@headers[arg])
else
nil
end
when :all
inspect_hex(0)
end
end
# For packets, inspect is overloaded as inspect_hex(0).
# Not sure if this is a great idea yet, but it sure makes
# the irb output more sane.
#
# If you hate this, you can run PacketFu.toggle_inspect to return
# to the typical (and often unreadable) Object#inspect format.
def inspect
self.proto.join("|") + "\n" + self.inspect_hex
end
# Returns the size of the packet (as a binary string)
def size
self.to_s.size
end
# Returns an array of protocols contained in this packet. For example:
#
# t = PacketFu::TCPPacket.new
# => 00 1a c5 00 00 00 00 1a c5 00 00 00 08 00 45 00 ..............E.
# 00 28 3c ab 00 00 ff 06 7f 25 00 00 00 00 00 00 .(<......%......
# 00 00 93 5e 00 00 ad 4f e4 a4 00 00 00 00 50 00 ...^...O......P.
# 40 00 4a 92 00 00 @.J...
# t.proto
# => ["Eth", "IP", "TCP"]
#
def proto
type_array = []
self.headers.each {|header| type_array << header.class.to_s.split('::').last.gsub(/Header$/,'')}
type_array
end
alias_method :protocol, :proto
# Returns true if this is an Invalid packet. Else, false.
def is_invalid? ; self.proto.include? "Invalid"; end
# Returns true if this is an Ethernet packet. Else, false.
def is_ethernet? ; self.proto.include? "Eth"; end
alias_method :is_eth?, :is_ethernet?
# Returns true if this is an IP packet. Else, false.
def is_ip? ; self.proto.include? "IP"; end
# Returns true if this is an TCP packet. Else, false.
def is_tcp? ; self.proto.include? "TCP"; end
# Returns true if this is an UDP packet. Else, false.
def is_udp? ; self.proto.include? "UDP"; end
# Returns true if this is an ARP packet. Else, false.
def is_arp? ; self.proto.include? "ARP"; end
# Returns true if this is an IPv6 packet. Else, false.
def is_ipv6? ; self.proto.include? "IPv6" ; end
# Returns true if this is an ICMP packet. Else, false.
def is_icmp? ; self.proto.include? "ICMP" ; end
# Returns true if this is an IPv6 packet. Else, false.
def is_ipv6? ; self.proto.include? "IPv6" ; end
# Returns true if the outermost layer has data. Else, false.
def has_data? ; self.payload.size.zero? ? false : true ; end
alias_method :length, :size
def initialize(args={})
if args[:config]
args[:config].each_pair do |k,v|
case k
when :eth_daddr; @eth_header.eth_daddr=v if @eth_header
when :eth_saddr; @eth_header.eth_saddr=v if @eth_header
when :ip_saddr; @ip_header.ip_saddr=v if @ip_header
when :iface; @iface = v
end
end
end
end
end # class Packet
@@inspect_style = :pretty
# If @@inspect_style is :ugly, set the inspect method to the usual inspect.
# By default, @@inspect_style is :pretty. This default may change if people
# hate it.
# Since PacketFu is designed with irb in mind, the normal inspect is way too
# verbose when new packets are created, and it ruins the aesthetics of the
# PacketFu console or quick hping-like exercises in irb.
#
# However, there are cases where knowing things like object id numbers, the complete
# @header array, etc. is useful (especially in debugging). So, toggle_inspect
# provides a means for a script to declar which style of inspect to use.
#
# This method may be an even worse idea than the original monkeypatch to Packet.inspect,
# since it would almost certainly be better to redefine inspect just in the PacketFu console.
# We'll see what happens.
#
# == Example
#
# irb(main):001:0> p = PacketFu::TCPPacket.new
# => Eth|IP|TCP
# 00 1a c5 00 00 00 00 1a c5 00 00 00 08 00 45 00 ..............E.
# 00 28 ea d7 00 00 ff 06 d0 f8 00 00 00 00 00 00 .(..............
# 00 00 a9 76 00 00 f9 28 7e 95 00 00 00 00 50 00 ...v...(~.....P.
# 40 00 4e b0 00 00 @.N...
# irb(main):002:0> PacketFu.toggle_inspect
# => :ugly
# irb(main):003:0> p = PacketFu::TCPPacket.new
# => #<PacketFu::TCPPacket:0xb7aaf96c @ip_header=#<struct PacketFu::IPHeader ip_v=4, ip_hl=5, ip_tos=#<struct StructFu::Int8 value=nil, endian=nil, width=1, default=0>, ip_len=#<struct StructFu::Int16 value=20, endian=:big, width=2, default=0>, ip_id=#<struct StructFu::Int16 value=58458, endian=:big, width=2, default=0>, ip_frag=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, ip_ttl=#<struct StructFu::Int8 value=32, endian=nil, width=1, default=0>, ip_proto=#<struct StructFu::Int8 value=6, endian=nil, width=1, default=0>, ip_sum=#<struct StructFu::Int16 value=65535, endian=:big, width=2, default=0>, ip_src=#<struct PacketFu::Octets o1=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o2=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o3=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o4=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>>, ip_dst=#<struct PacketFu::Octets o1=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o2=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o3=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>, o4=#<struct StructFu::Int8 value=0, endian=nil, width=1, default=0>>, body=#<struct PacketFu::TCPHeader tcp_src=#<struct StructFu::Int16 value=17222, endian=:big, width=2, default=0>, tcp_dst=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, tcp_seq=#<struct StructFu::Int32 value=1528113240, endian=:big, width=4, default=0>, tcp_ack=#<struct StructFu::Int32 value=nil, endian=:big, width=4, default=0>, tcp_hlen=#<struct PacketFu::TcpHlen hlen=5>, tcp_reserved=#<struct PacketFu::TcpReserved r1=0, r2=0, r3=0>, tcp_ecn=#<struct PacketFu::TcpEcn n=nil, c=nil, e=nil>, tcp_flags=#<struct PacketFu::TcpFlags urg=0, ack=0, psh=0, rst=0, syn=0, fin=0>, tcp_win=#<struct StructFu::Int16 value=16384, endian=:big, width=2, default=0>, tcp_sum=#<struct StructFu::Int16 value=43333, endian=:big, width=2, default=0>, tcp_urg=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, tcp_opts=[], body="">>, @tcp_header=#<struct PacketFu::TCPHeader tcp_src=#<struct StructFu::Int16 value=17222, endian=:big, width=2, default=0>, tcp_dst=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, tcp_seq=#<struct StructFu::Int32 value=1528113240, endian=:big, width=4, default=0>, tcp_ack=#<struct StructFu::Int32 value=nil, endian=:big, width=4, default=0>, tcp_hlen=#<struct PacketFu::TcpHlen hlen=5>, tcp_reserved=#<struct PacketFu::TcpReserved r1=0, r2=0, r3=0>, tcp_ecn=#<struct PacketFu::TcpEcn n=nil, c=nil, e=nil>, tcp_flags=#<struct PacketFu::TcpFlags urg=0, ack=0, psh=0, rst=0, syn=0, fin=0>, tcp_win=#<struct StructFu::Int16 value=16384, endian=:big, width=2, default=0>, tcp_sum=#<struct StructFu::Int16 value=43333, endian=:big, width=2, default=0>, tcp_urg=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, tcp_opts=[], body="">, @eth_header=#<struct PacketFu::EthHeader eth_dst=#<struct PacketFu::EthMac oui=#<struct PacketFu::EthOui b0=nil, b1=nil, b2=nil, b3=nil, b4=nil, b5=nil, local=0, multicast=nil, oui=428>, nic=#<struct PacketFu::EthNic n0=nil, n1=nil, n2=nil>>, eth_src=#<struct PacketFu::EthMac oui=#<struct PacketFu::EthOui b0=nil, b1=nil, b2=nil, b3=nil, b4=nil, b5=nil, local=0, multicast=nil, oui=428>, nic=#<struct PacketFu::EthNic n0=nil, n1=nil, n2=nil>>, eth_proto=#<struct StructFu::Int16 value=2048, endian=:big, width=2, default=0>, body=#<struct PacketFu::IPHeader ip_v=4, ip_hl=5, ip_tos=#<struct StructFu::Int8 value=nil, endian=nil, width=1, default=0>, ip_len=#<struct StructFu::Int16 value=20, endian=:big, width=2, default=0>, ip_id=#<struct StructFu::Int16 value=58458, endian=:big, width=2, default=0>, ip_frag=#<struct StructFu::Int16 value=nil, endian=:big, width=2, default=0>, ip_ttl=#<struct StructFu::Int8 value=32, endian=nil, width=1, default=0>, ip_proto=#<struct StructFu::Int8 value=6, endian=nil, width=1, default=0>, ip_sum=#<struct StructFu::Int16 value=65535, endian=:big, width=2, default=0>, ip_
# irb(main):004:0>
def toggle_inspect
if @@inspect_style == :pretty
eval("class Packet; def inspect; super; end; end")
@@inspect_style = :ugly
else
eval("class Packet; def inspect; self.proto.join('|') + \"\n\" + self.inspect_hex; end; end")
@@inspect_style = :pretty
end
end
end
# vim: nowrap sw=2 sts=0 ts=2 ff=unix ft=ruby