PenTest/nmap
1
0
Fork 0
mirror of https://github.com/nmap/nmap.git synced 2025-12-18 21:49:01 +00:00
Code Issues Projects Releases Wiki Activity
Files
46dade7cd89bae584f16a512bfbfefee4e67a905
nmap/scripts/qscan.nse
kris 918a1bb909 o [NSE] Added the qscan script to repeatedly probe ports on a host to 
gather round-trip times for each port.  The script then uses these
  times to group together ports with statistically equivalent RTTs.
  Ports in different groups could be the result of things such as port
  forwarding to hosts behind a NAT.  This is based on work by Doug
  Hoyte. [Kris]
2010-03-21 20:05:31 +00:00

456 lines
12 KiB
Lua
Raw Blame History

description = [[
Repeatedly probe open and/or closed ports on a host to obtain a series
of round-trip time values for each port. These values are used to
group collections of ports which are statistically different from other
groups. Ports being in different groups (or "families") may be due to
network mechanisms such as port forwarding to machines behind a NAT.
In order to group these ports into different families, some statistical
values must be computed. Among these values are the mean and standard
deviation of the round-trip times for each port. Once all of the times
have been recorded and these values have been computed, the Student's
t-test is used to test the statistical significance of the differences
between each port's data. Ports which have round-trip times that are
statistically the same are grouped together in the same family.
This script is based on Doug Hoyte's Qscan documentation and patches
for Nmap.
]]
-- See http://hcsw.org/nmap/QSCAN for more on Doug's research
---
-- @usage
-- nmap --script qscan --script-args qscan.confidence=<c>,qscan.delay=<d>,qscan.numtrips=<n> target
--
-- @args confidence Confidence level: 0.75, 0.9, 0.95, 0.975, 0.99, 0.995, 0.9995
-- @args delay Average delay between packet sends (milliseconds): between 0.5d and 1.5d
-- @args numtrips Number of round-trip times to try to get
--
-- @output
-- | qscan:
-- | PORT FAMILY MEAN (ms) STDDEV LOSS (%)
-- | 21 0 2.70 1.25 0.0%
-- | 22 0 2.50 0.53 0.0%
-- | 23 1 4.80 0.63 0.0%
-- | 25 0 2.40 0.52 0.0%
-- | 80 0 2.40 0.70 0.0%
-- |_443 0 2.40 0.52 0.0%
--
-- 03/17/2010
author = "Kris Katterjohn <katterjohn[at]gmail.com>"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"safe", "discovery"}
require 'bin'
require 'packet'
require 'tab'
-- defaults
local DELAY = 200
local NUMTRIPS = 10
local CONF = 0.95
-- The following tdist{} and tinv() are based off of
-- http://www.owlnet.rice.edu/~elec428/projects/tinv.c
local tdist = {
-- 75% 90% 95% 97.5% 99% 99.5% 99.95%
{ 1.0000, 3.0777, 6.3138, 12.7062, 31.8207, 63.6574, 636.6192 }, -- 1
{ 0.8165, 1.8856, 2.9200, 4.3027, 6.9646, 9.9248, 31.5991 }, -- 2
{ 0.7649, 1.6377, 2.3534, 3.1824, 4.5407, 5.8409, 12.9240 }, -- 3
{ 0.7407, 1.5332, 2.1318, 2.7764, 3.7649, 4.6041, 8.6103 }, -- 4
{ 0.7267, 1.4759, 2.0150, 2.5706, 3.3649, 4.0322, 6.8688 }, -- 5
{ 0.7176, 1.4398, 1.9432, 2.4469, 3.1427, 3.7074, 5.9588 }, -- 6
{ 0.7111, 1.4149, 1.8946, 2.3646, 2.9980, 3.4995, 5.4079 }, -- 7
{ 0.7064, 1.3968, 1.8595, 3.3060, 2.8965, 3.3554, 5.0413 }, -- 8
{ 0.7027, 1.3830, 1.8331, 2.2622, 2.8214, 3.2498, 4.7809 }, -- 9
{ 0.6998, 1.3722, 1.8125, 2.2281, 2.7638, 1.1693, 4.5869 }, -- 10
{ 0.6974, 1.3634, 1.7959, 2.2010, 2.7181, 3.1058, 4.4370 }, -- 11
{ 0.6955, 1.3562, 1.7823, 2.1788, 2.6810, 3.0545, 4.3178 }, -- 12
{ 0.6938, 1.3502, 1.7709, 2.1604, 2.6403, 3.0123, 4.2208 }, -- 13
{ 0.6924, 1.3450, 1.7613, 2.1448, 2.6245, 2.9768, 4.1405 }, -- 14
{ 0.6912, 1.3406, 1.7531, 2.1315, 2.6025, 2.9467, 4.0728 }, -- 15
{ 0.6901, 1.3368, 1.7459, 2.1199, 2.5835, 2.9208, 4.0150 }, -- 16
{ 0.6892, 1.3334, 1.7396, 2.1098, 2.5669, 2.8982, 3.9651 }, -- 17
{ 0.6884, 1.3304, 1.7341, 2.1009, 2.5524, 2.8784, 3.9216 }, -- 18
{ 0.6876, 1.3277, 1.7291, 2.0930, 2.5395, 2.8609, 3.8834 }, -- 19
{ 0.6870, 1.3253, 1.7247, 2.0860, 2.5280, 2.8453, 3.8495 }, -- 20
{ 0.6844, 1.3163, 1.7081, 2.0595, 2.4851, 2.7874, 3.7251 }, -- 25
{ 0.6828, 1.3104, 1.6973, 2.0423, 2.4573, 2.7500, 3.6460 }, -- 30
{ 0.6816, 1.3062, 1.6896, 2.0301, 2.4377, 2.7238, 3.5911 }, -- 35
{ 0.6807, 1.3031, 1.6839, 2.0211, 2.4233, 2.7045, 3.5510 }, -- 40
{ 0.6800, 1.3006, 1.6794, 2.0141, 2.4121, 2.6896, 3.5203 }, -- 45
{ 0.6794, 1.2987, 1.6759, 2.0086, 2.4033, 2.6778, 3.4960 }, -- 50
{ 0.6786, 1.2958, 1.6706, 2.0003, 2.3901, 2.6603, 3.4602 }, -- 60
{ 0.6780, 1.2938, 1.6669, 1.9944, 2.3808, 2.6479, 3.4350 }, -- 70
{ 0.6776, 1.2922, 1.6641, 1.9901, 2.3739, 2.6387, 3.4163 }, -- 80
{ 0.6772, 1.2910, 1.6620, 1.9867, 2.3685, 2.6316, 3.4019 }, -- 90
{ 0.6770, 1.2901, 1.6602, 1.9840, 2.3642, 2.6259, 3.3905 } -- 100
}
local tinv = function(p, dof)
local din, pin
if dof >= 1 and dof <= 20 then
din = dof
elseif dof < 25 then
din = 20
elseif dof < 30 then
din = 21
elseif dof < 35 then
din = 22
elseif dof < 40 then
din = 23
elseif dof < 45 then
din = 24
elseif dof < 50 then
din = 25
elseif dof < 60 then
din = 26
elseif dof < 70 then
din = 27
elseif dof < 80 then
din = 28
elseif dof < 90 then
din = 29
elseif dof < 100 then
din = 30
elseif dof >= 100 then
din = 31
end
if p == 0.75 then
pin = 1
elseif p == 0.9 then
pin = 2
elseif p == 0.95 then
pin = 3
elseif p == 0.975 then
pin = 4
elseif p == 0.99 then
pin = 5
elseif p == 0.995 then
pin = 6
elseif p == 0.9995 then
pin = 7
end
return tdist[din][pin]
end
--- Calculates intermediate t statistic
local tstat = function(n1, n2, u1, u2, v1, v2)
local dof = n1 + n2 - 2
local a = (n1 + n2) / (n1 * n2)
--local b = ((n1 - 1) * (s1 * s1) + (n2 - 1) * (s2 * s2))
local b = ((n1 - 1) * v1) + ((n2 - 1) * v2)
return math.abs(u1 - u2) / math.sqrt(a * (b / dof))
end
--- Pcap callback
-- @return Destination and source IP addresses and TCP ports
local callback = function(size, layer2, layer3)
local ip = packet.Packet:new(layer3, layer3:len())
return bin.pack('AA=S=S', ip.ip_bin_dst, ip.ip_bin_src, ip.tcp_dport, ip.tcp_sport)
end
--- Updates a TCP Packet object
-- @param tcp The TCP object
local updatepkt = function(tcp, dport)
tcp:tcp_set_sport(math.random(0x401, 0xffff))
tcp:tcp_set_dport(dport)
tcp:tcp_set_seq(math.random(1, 0x7fffffff))
tcp:tcp_count_checksum(tcp.ip_len)
tcp:ip_count_checksum()
end
--- Create a TCP Packet object
-- @param host Host object
-- @param port Port number
-- @return TCP Packet object
local genericpkt = function(host)
local pkt = bin.pack("H",
"4500 002c 55d1 0000 8006 0000 0000 0000" ..
"0000 0000 0000 0000 0000 0000 0000 0000" ..
"6002 0c00 0000 0000 0204 05b4"
)
local tcp = packet.Packet:new(pkt, pkt:len())
tcp:ip_set_bin_src(host.bin_ip_src)
tcp:ip_set_bin_dst(host.bin_ip)
updatepkt(tcp, 0)
return tcp
end
--- Calculates "family" values for grouping
-- @param stats Statistics table
-- @param conf Confidence level
local calcfamilies = function(stats, conf)
local i, j
local famidx = 0
local stat
local crit
for _, i in pairs(stats) do repeat
if i.fam ~= -1 then
break
end
i.fam = famidx
famidx = famidx + 1
for _, j in pairs(stats) do repeat
if j.port == i.port or j.fam ~= -1 then
break
end
stat = tstat(i.num, j.num, i.mean, j.mean, i.K / (i.num - 1), j.K / (j.num - 1))
crit = tinv(conf, i.num + j.num - 2)
if stat < crit then
j.fam = i.fam
end
until true end
until true end
end
--- Builds report for output
-- @param stats Array of port statistics
-- @return Output report
local report = function(stats)
local j
local outtab = tab.new(5)
tab.add(outtab, 1, "PORT")
tab.add(outtab, 2, "FAMILY")
tab.add(outtab, 3, "MEAN (ms)")
tab.add(outtab, 4, "STDDEV")
tab.add(outtab, 5, "LOSS (%)")
for _, j in pairs(stats) do
port = tostring(j.port)
fam = tostring(j.fam)
mean = string.format("%.2f", j.mean)
stddev = string.format("%.2f", math.sqrt(j.K / (j.num - 1)))
loss = string.format("%.1f%%", 100 * (1 - j.num / j.sent))
tab.nextrow(outtab)
tab.add(outtab, 1, port)
tab.add(outtab, 2, fam)
tab.add(outtab, 3, mean)
tab.add(outtab, 4, stddev)
tab.add(outtab, 5, loss)
end
return tab.dump(outtab)
end
--- Returns option values based on script arguments and defaults
-- @return Confidence level, delay and number of trips
local getopts = function()
local conf, delay, numtrips = CONF, DELAY, NUMTRIPS
local bool, err
local k
for _, k in ipairs({"qscan.confidence", "confidence"}) do
if nmap.registry.args[k] then
conf = tonumber(nmap.registry.args[k])
break
end
end
for _, k in ipairs({"qscan.delay", "delay"}) do
if nmap.registry.args[k] then
delay = tonumber(nmap.registry.args[k])
break
end
end
for _, k in ipairs({"qscan.numtrips", "numtrips"}) do
if nmap.registry.args[k] then
numtrips = tonumber(nmap.registry.args[k])
break
end
end
bool = true
if conf ~= 0.75 and conf ~= 0.9 and
conf ~= 0.95 and conf ~= 0.975 and
conf ~= 0.99 and conf ~= 0.995 and conf ~= 0.995 then
bool = false
err = "Invalid confidence level"
end
if delay < 0 then
bool = false
err = "Invalid (negative) delay"
end
if numtrips < 3 then
bool = false
err = "Invalid number of trips (should be >= 3)"
end
if bool then
return bool, conf, delay, numtrips
else
return bool, err
end
end
--- Get ports to probe
-- @param host Host object
local getports = function(host)
local states = { "closed", "open" }
local ports = {}
local port = nil
for _, s in ipairs(states) do
repeat
port = nmap.get_ports(host, port, "tcp", s)
if port then
table.insert(ports, port.number)
end
until not port
end
return ports
end
--- Sets probe port list in registry
-- @param host Host object
-- @param ports Port list
local setreg = function(host, ports)
if not nmap.registry[host.ip] then
nmap.registry[host.ip] = {}
end
nmap.registry[host.ip]['qscanports'] = ports
end
hostrule = function(host)
if not nmap.is_privileged() then
if not nmap.registry['qscan'] then
nmap.registry['qscan'] = {}
end
if nmap.registry['qscan']['rootfail'] then
return false
end
nmap.registry['qscan']['rootfail'] = true
if nmap.verbosity() > 0 then
nmap.log_write("stdout", "QSCAN: not running for lack of privileges")
end
return false
end
if not host.interface then
return false
end
local ports = getports(host)
if #ports <= 1 then
return false
end
setreg(host, ports)
return true
end
action = function(host)
local i, j, k
local sock = nmap.new_dnet()
local pcap = nmap.new_socket()
local ports = nmap.registry[host.ip]['qscanports']
local saddr = packet.toip(host.bin_ip_src)
local daddr = packet.toip(host.bin_ip)
local port
local start, stop
local rtt
local stats = {}
local try = nmap.new_try()
local conf, delay, numtrips = try(getopts())
pcap:pcap_open(host.interface, 104, 0, callback, "tcp and dst host " .. saddr .. " and src host " .. daddr)
try(sock:ip_open())
try = nmap.new_try(function() sock:ip_close() end)
pcap:set_timeout(3000)
local tcp = genericpkt(host)
i = 1
while i <= numtrips do
for j, _ in ipairs(ports) do
port = ports[j]
updatepkt(tcp, port)
if not stats[j] then
stats[j] = {}
stats[j].port = port
stats[j].num = 0
stats[j].sent = 0
stats[j].mean = 0
stats[j].K = 0
stats[j].fam = -1
end
pcap:pcap_register(bin.pack('AA=S=S', tcp.ip_bin_src, tcp.ip_bin_dst, tcp.tcp_sport, tcp.tcp_dport))
start = nmap.clock_ms()
try(sock:ip_send(tcp.buf))
stats[j].sent = stats[j].sent + 1
local status, len, _, pkt = pcap:pcap_receive()
stop = nmap.clock_ms()
rtt = stop - start
if status then
-- update more stats on the port, Knuth-style
local delta
stats[j].num = stats[j].num + 1
delta = rtt - stats[j].mean
stats[j].mean = stats[j].mean + delta / stats[j].num
stats[j].K = stats[j].K + delta * (rtt - stats[j].mean)
end
-- Unlike qscan.cc which loops around while waiting for
-- the delay, I just sleep here (depending on rtt)
if rtt < (3 * delay) / 2 then
if rtt < (delay / 2) then
k = ((delay / 2) + math.random(0, delay) - rtt)
else
k = math.random((3 * delay) / 2 - rtt)
end
stdnse.sleep(k / 1000)
end
end
i = i + 1
end
sock:ip_close()
pcap:pcap_close()
-- sort by port number
table.sort(stats, function(t1, t2) return t1.port < t2.port end)
calcfamilies(stats, conf)
return " \n" .. report(stats)
end
Reference in New Issue View Git Blame Copy Permalink