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|
## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license
"""
Clone of Nmap's first generation OS fingerprinting.
"""
import os
from scapy.data import KnowledgeBase
from scapy.config import conf
from scapy.arch import WINDOWS
if WINDOWS:
conf.nmap_base=os.environ["ProgramFiles"] + "\\nmap\\nmap-os-fingerprints"
else:
conf.nmap_base ="/usr/share/nmap/nmap-os-fingerprints"
######################
## nmap OS fp stuff ##
######################
class NmapKnowledgeBase(KnowledgeBase):
def lazy_init(self):
try:
f=open(self.filename)
except IOError:
return
self.base = []
name = None
try:
for l in f:
l = l.strip()
if not l or l[0] == "#":
continue
if l[:12] == "Fingerprint ":
if name is not None:
self.base.append((name,sig))
name = l[12:].strip()
sig={}
p = self.base
continue
elif l[:6] == "Class ":
continue
op = l.find("(")
cl = l.find(")")
if op < 0 or cl < 0:
warning("error reading nmap os fp base file")
continue
test = l[:op]
s = map(lambda x: x.split("="), l[op+1:cl].split("%"))
si = {}
for n,v in s:
si[n] = v
sig[test]=si
if name is not None:
self.base.append((name,sig))
except:
self.base = None
warning("Can't read nmap database [%s](new nmap version ?)" % self.filename)
f.close()
nmap_kdb = NmapKnowledgeBase(conf.nmap_base)
def TCPflags2str(f):
fl="FSRPAUEC"
s=""
for i in range(len(fl)):
if f & 1:
s = fl[i]+s
f >>= 1
return s
def nmap_tcppacket_sig(pkt):
r = {}
if pkt is not None:
# r["Resp"] = "Y"
r["DF"] = (pkt.flags & 2) and "Y" or "N"
r["W"] = "%X" % pkt.window
r["ACK"] = pkt.ack==2 and "S++" or pkt.ack==1 and "S" or "O"
r["Flags"] = TCPflags2str(pkt.payload.flags)
r["Ops"] = "".join(map(lambda x: x[0][0],pkt.payload.options))
else:
r["Resp"] = "N"
return r
def nmap_udppacket_sig(S,T):
r={}
if T is None:
r["Resp"] = "N"
else:
r["DF"] = (T.flags & 2) and "Y" or "N"
r["TOS"] = "%X" % T.tos
r["IPLEN"] = "%X" % T.len
r["RIPTL"] = "%X" % T.payload.payload.len
r["RID"] = S.id == T.payload.payload.id and "E" or "F"
r["RIPCK"] = S.chksum == T.getlayer(IPerror).chksum and "E" or T.getlayer(IPerror).chksum == 0 and "0" or "F"
r["UCK"] = S.payload.chksum == T.getlayer(UDPerror).chksum and "E" or T.getlayer(UDPerror).chksum ==0 and "0" or "F"
r["ULEN"] = "%X" % T.getlayer(UDPerror).len
r["DAT"] = T.getlayer(conf.raw_layer) is None and "E" or S.getlayer(conf.raw_layer).load == T.getlayer(conf.raw_layer).load and "E" or "F"
return r
def nmap_match_one_sig(seen, ref):
c = 0
for k in seen.keys():
if ref.has_key(k):
if seen[k] in ref[k].split("|"):
c += 1
if c == 0 and seen.get("Resp") == "N":
return 0.7
else:
return 1.0*c/len(seen.keys())
def nmap_sig(target, oport=80, cport=81, ucport=1):
res = {}
tcpopt = [ ("WScale", 10),
("NOP",None),
("MSS", 256),
("Timestamp",(123,0)) ]
tests = [ IP(dst=target, id=1)/TCP(seq=1, sport=5001, dport=oport, options=tcpopt, flags="CS"),
IP(dst=target, id=1)/TCP(seq=1, sport=5002, dport=oport, options=tcpopt, flags=0),
IP(dst=target, id=1)/TCP(seq=1, sport=5003, dport=oport, options=tcpopt, flags="SFUP"),
IP(dst=target, id=1)/TCP(seq=1, sport=5004, dport=oport, options=tcpopt, flags="A"),
IP(dst=target, id=1)/TCP(seq=1, sport=5005, dport=cport, options=tcpopt, flags="S"),
IP(dst=target, id=1)/TCP(seq=1, sport=5006, dport=cport, options=tcpopt, flags="A"),
IP(dst=target, id=1)/TCP(seq=1, sport=5007, dport=cport, options=tcpopt, flags="FPU"),
IP(str(IP(dst=target)/UDP(sport=5008,dport=ucport)/(300*"i"))) ]
ans, unans = sr(tests, timeout=2)
ans += map(lambda x: (x,None), unans)
for S,T in ans:
if S.sport == 5008:
res["PU"] = nmap_udppacket_sig(S,T)
else:
t = "T%i" % (S.sport-5000)
if T is not None and T.haslayer(ICMP):
warning("Test %s answered by an ICMP" % t)
T=None
res[t] = nmap_tcppacket_sig(T)
return res
def nmap_probes2sig(tests):
tests=tests.copy()
res = {}
if "PU" in tests:
res["PU"] = nmap_udppacket_sig(*tests["PU"])
del(tests["PU"])
for k in tests:
res[k] = nmap_tcppacket_sig(tests[k])
return res
def nmap_search(sigs):
guess = 0,[]
for os,fp in nmap_kdb.get_base():
c = 0.0
for t in sigs.keys():
if t in fp:
c += nmap_match_one_sig(sigs[t], fp[t])
c /= len(sigs.keys())
if c > guess[0]:
guess = c,[ os ]
elif c == guess[0]:
guess[1].append(os)
return guess
@conf.commands.register
def nmap_fp(target, oport=80, cport=81):
"""nmap fingerprinting
nmap_fp(target, [oport=80,] [cport=81,]) -> list of best guesses with accuracy
"""
sigs = nmap_sig(target, oport, cport)
return nmap_search(sigs)
@conf.commands.register
def nmap_sig2txt(sig):
torder = ["TSeq","T1","T2","T3","T4","T5","T6","T7","PU"]
korder = ["Class", "gcd", "SI", "IPID", "TS",
"Resp", "DF", "W", "ACK", "Flags", "Ops",
"TOS", "IPLEN", "RIPTL", "RID", "RIPCK", "UCK", "ULEN", "DAT" ]
txt=[]
for i in sig.keys():
if i not in torder:
torder.append(i)
for t in torder:
sl = sig.get(t)
if sl is None:
continue
s = []
for k in korder:
v = sl.get(k)
if v is None:
continue
s.append("%s=%s"%(k,v))
txt.append("%s(%s)" % (t, "%".join(s)))
return "\n".join(txt)
|
