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[NSE] Added support for decoding EIGRP broadcasts from Cisco routers to broadcast-listener.nse

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tomsellers
2012-02-12 21:20:16 +00:00
parent 631515a5ed
commit 7807926f15
3 changed files with 656 additions and 508 deletions
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3
CHANGELOG
View File

@@ -1,5 +1,8 @@
# Nmap Changelog ($Id$); -*-text-*-
o [NSE] Added support for decoding EIGRP broadcasts from Cisco routers
to broadcast-listener. [Tom]
o [NSE] Added redirect support to the http library. All calls to http.get and
http.head now transparently handle any HTTP redirects. [Patrik]

149
nselib/data/packetdecoders.lua
View File

@@ -27,6 +27,7 @@
-- o Ether
-- x ARP requests (IPv4)
-- x CDP - Cisco Discovery Protocol
-- x EIGRP - Cisco Enhanced Interior Gateway Routing Protocol
--
-- o UDP
-- x DHCP
@@ -42,8 +43,9 @@
-- @author "Patrik Karlsson <patrik@cqure.net>"
-- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
-- Version 0.1
-- Version 0.2
-- Created 07/25/2011 - v0.1 - created by Patrik Karlsson
-- 02/12/2012 - v.02 - added support for EIGRP - Tom Sellers
require 'target'
@@ -147,7 +149,150 @@ Decoders = {
end,
getResults = function(self) return { name = "CDP", (self.results and tab.dump(self.results) or "") } end,
}
},
-- EIGRP Query & Update
['020[13]....00000000'] = {
new = function(self)
local o = { dups = {} }
setmetatable(o, self)
self.__index = self
return o
end,
process = function(self, layer3)
local p = packet.Packet:new( layer3, #layer3 )
local data = layer3:sub(p.ip_data_offset + 1)
-- Extract the EIGRP header
local pos, ver, opcode, checksum, flags, seq, ack, asnum = bin.unpack(">CCSiiii", data)
local route_type, size, nexthop, delay, bandwidth, temp, mtu, orig_router, orig_as, arbtag
local hop_count, reliability, load, reserved, mask
local destination
-- Iterate over the routes
while ( pos < #data ) do
-- Get the route type as the packet construction varies
pos,route_type = bin.unpack(">S", data, pos)
if ( route_type == 258 ) then
route_type = 'internal'
pos, size, nexthop, delay, bandwidth, temp, mtu = bin.unpack(">SiiiCS", data, pos)
pos, hop_count, reliability, load, reserved, mask = bin.unpack(">CCCSC", data, pos)
local oct1, oct2, oct3, oct4 = 0, 0, 0, 0
-- unneeded address octets are left out of the packets, lets fill in the gaps
if ( size == 29 ) then
-- mask 25 or above
pos, oct1, oct2, oct3, oct4 = bin.unpack(">CCCC", data, pos)
elseif ( size == 28 ) then
pos, oct1, oct2, oct3 = bin.unpack(">CCC", data, pos)
elseif ( size == 27 ) then
pos, oct1, oct2 = bin.unpack(">CC", data, pos)
elseif ( size == 26 ) then
pos, oct1 = bin.unpack(">C", data, pos)
end
destination = oct1 .. '.' .. oct2 .. '.' .. oct3 .. '.' .. oct4 .. "/" .. mask
orig_router = 'n/a'
elseif ( route_type == 259 ) then
-- external route, from a different routing protocol
pos, size, nexthop = bin.unpack(">Si", data, pos)
local orig_rtr_oct1, orig_rtr_oct2, orig_rtr_oct3, orig_rtr_oct4
pos, orig_rtr_oct1, orig_rtr_oct2, orig_rtr_oct3, orig_rtr_oct4 = bin.unpack(">CCCC", data, pos)
orig_router = orig_rtr_oct1 .. '.' .. orig_rtr_oct2 .. '.' .. orig_rtr_oct3 .. '.' .. orig_rtr_oct4
pos, orig_as, arbtag, ext_metric = bin.unpack(">iii", data, pos)
pos, reserved, ext_proto_id, flags, delay, bandwidth = bin.unpack(">SCCii", data, pos)
pos, temp, mtu, hop_count, reliability, load, reserved, mask = bin.unpack(">CSCCCSC", data, pos)
local oct1, oct2, oct3, oct4 = 0, 0, 0, 0
-- unneeded address octets are left out of the packets, lets fill in the gaps
if ( size == 49 ) then
-- mask 25 or above
pos, oct1, oct2, oct3, oct4 = bin.unpack(">CCCC", data, pos)
elseif ( size == 48 ) then
pos, oct1, oct2, oct3 = bin.unpack(">CCC", data, pos)
elseif ( size == 47 ) then
pos, oct1, oct2 = bin.unpack(">CC", data, pos)
elseif ( size == 46 ) then
pos, oct1 = bin.unpack(">C", data, pos)
end
destination = oct1 .. '.' .. oct2 .. '.' .. oct3 .. '.' .. oct4 .. "/" .. mask
local Proto_Types = {
[1] = 'external (IGRP)',
[2] = 'external (EIGRP)',
[3] = 'external (static)',
[4] = 'external (RIP)',
[6] = 'external (OSPF)',
[9] = 'external (RIP)'
}
route_type = Proto_Types[ext_proto_id]
end
if ( not(self.results) ) then
self.results = tab.new(9)
tab.addrow(self.results, 'sender ip', 'AS#', 'route type', 'destination', 'hop', 'bandwidth', 'delay', 'seq','orig router')
end
if (delay == -1) then delay = 'unreachable' end
if ( not(self.dups[("%s:%s:s:%s"):format(p.ip_src,asnum,destination,seq)]) ) then
if ( target.ALLOW_NEW_TARGETS ) then target.add(p.ip_src) end
self.dups[("%s:%s:%s:%s"):format(p.ip_src,asnum,destination,seq)] = true
tab.addrow( self.results, p.ip_src, asnum, route_type, destination, hop_count, bandwidth, delay, seq, orig_router )
end
end
end,
getResults = function(self) return { name = "EIGRP Query", (self.results and tab.dump(self.results) or "") } end,
},
['0205....00000000'] = {
new = function(self)
local o = { dups = {} }
setmetatable(o, self)
self.__index = self
return o
end,
process = function(self, layer3)
local p = packet.Packet:new( layer3, #layer3 )
local data = layer3:sub(p.ip_data_offset + 1)
-- Extract the EIGRP header
local pos, ver, opcode, checksum, flags, seq, ack, asnum = bin.unpack(">CCSiiii", data)
-- Skip the parameters for now.
pos = pos + 10
local holdtime, software, size, ios_major, ios_minor, eigrp_major, eigrp_minor
pos, holdtime, software, size, ios_major, ios_minor, eigrp_major, eigrp_minor = bin.unpack(">SSSCCCC", data, pos)
if ( not(self.results) ) then
self.results = tab.new(5)
tab.addrow(self.results, 'sender ip', 'AS number', 'hold time', 'EIGRP version', 'IOS version')
end
if ( not(self.dups[("%s:%s"):format(p.ip_src,asnum)]) ) then
if ( target.ALLOW_NEW_TARGETS ) then target.add(p.ip_src) end
self.dups[("%s:%s"):format(p.ip_src,asnum)] = true
tab.addrow( self.results, p.ip_src, asnum, holdtime, eigrp_major .. '.' .. eigrp_minor, ios_major .. '.' .. ios_minor )
end
end,
getResults = function(self) return { name = "EIGRP Hello", (self.results and tab.dump(self.results) or "") } end,
},
},

4
scripts/broadcast-listener.nse
View File

@@ -134,8 +134,8 @@ sniffInterface = function(iface, Decoders, decodertab)
-- default to 30 seconds, if nothing else was set
timeout = timeout and (timeout * 1000) or (30 * 1000)
-- We wan't all packets that aren't explicitly for us
sock:pcap_open(iface.name, 1500, false, ("!host %s"):format(iface.address))
-- We want all packets that aren't explicitly for us
sock:pcap_open(iface.name, 1500, true, ("!host %s"):format(iface.address))
-- Set a short timeout so that we can timeout in time if needed
sock:set_timeout(100)