#!/usr/bin/env python
"""
$Id$
This file is part of the sqlmap project, http://sqlmap.sourceforge.net.
Copyright (c) 2007-2009 Bernardo Damele A. G. <bernardo.damele@gmail.com>
Copyright (c) 2006 Daniele Bellucci <daniele.bellucci@gmail.com>
sqlmap is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation version 2 of the License.
sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along
with sqlmap; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
import threading
import time
import traceback
from lib.core.agent import agent
from lib.core.common import dataToSessionFile
from lib.core.common import dataToStdout
from lib.core.common import getCharset
from lib.core.common import replaceNewlineTabs
from lib.core.common import safeStringFormat
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.exception import sqlmapConnectionException
from lib.core.exception import sqlmapValueException
from lib.core.exception import sqlmapThreadException
from lib.core.exception import unhandledException
from lib.core.progress import ProgressBar
from lib.core.unescaper import unescaper
from lib.request.connect import Connect as Request
def bisection(payload, expression, length=None, charsetType=None, firstChar=None, lastChar=None):
"""
Bisection algorithm that can be used to perform blind SQL injection
on an affected host
"""
partialValue = ""
finalValue = ""
asciiTbl = getCharset(charsetType)
if "LENGTH(" in expression or "LEN(" in expression:
firstChar = 0
elif conf.firstChar is not None and ( isinstance(conf.firstChar, int) or ( isinstance(conf.firstChar, str) and conf.firstChar.isdigit() ) ):
firstChar = int(conf.firstChar) - 1
elif firstChar is None:
firstChar = 0
elif ( isinstance(firstChar, str) and firstChar.isdigit() ) or isinstance(firstChar, int):
firstChar = int(firstChar) - 1
if "LENGTH(" in expression or "LEN(" in expression:
lastChar = 0
elif conf.lastChar is not None and ( isinstance(conf.lastChar, int) or ( isinstance(conf.lastChar, str) and conf.lastChar.isdigit() ) ):
lastChar = int(conf.lastChar)
elif lastChar in ( None, "0" ):
lastChar = 0
elif ( isinstance(lastChar, str) and lastChar.isdigit() ) or isinstance(lastChar, int):
lastChar = int(lastChar)
if kb.dbmsDetected:
_, _, _, _, _, _, fieldToCastStr = agent.getFields(expression)
nulledCastedField = agent.nullAndCastField(fieldToCastStr)
expressionReplaced = expression.replace(fieldToCastStr, nulledCastedField, 1)
expressionUnescaped = unescaper.unescape(expressionReplaced)
else:
expressionUnescaped = unescaper.unescape(expression)
debugMsg = "query: %s" % expressionUnescaped
logger.debug(debugMsg)
if length and not isinstance(length, int) and length.isdigit():
length = int(length)
if length == 0:
return 0, ""
if lastChar > 0 and length > ( lastChar - firstChar ):
length = ( lastChar - firstChar )
showEta = conf.eta and isinstance(length, int)
numThreads = min(conf.threads, length)
threads = []
if showEta:
progress = ProgressBar(maxValue=length)
progressTime = []
if conf.verbose >= 1 and not showEta:
if isinstance(length, int) and conf.threads > 1:
infoMsg = "starting %d threads" % numThreads
logger.info(infoMsg)
dataToStdout("[%s] [INFO] retrieved: %s" % (time.strftime("%X"), "_" * length))
dataToStdout("\r[%s] [INFO] retrieved: " % time.strftime("%X"))
else:
dataToStdout("[%s] [INFO] retrieved: " % time.strftime("%X"))
queriesCount = [0] # As list to deal with nested scoping rules
def getChar(idx, asciiTbl=asciiTbl):
maxValue = asciiTbl[len(asciiTbl)-1]
minValue = 0
while len(asciiTbl) != 1:
queriesCount[0] += 1
position = (len(asciiTbl) / 2)
posValue = asciiTbl[position]
forgedPayload = safeStringFormat(payload, (expressionUnescaped, idx, posValue))
result = Request.queryPage(forgedPayload)
if result:
minValue = posValue
asciiTbl = asciiTbl[position:]
else:
maxValue = posValue
asciiTbl = asciiTbl[:position]
if len(asciiTbl) == 1:
if maxValue == 1:
return None
else:
return chr(minValue + 1)
def etaProgressUpdate(charTime, index):
if len(progressTime) <= ( (length * 3) / 100 ):
eta = 0
else:
midTime = sum(progressTime) / len(progressTime)
midTimeWithLatest = (midTime + charTime) / 2
eta = midTimeWithLatest * (length - index) / conf.threads
progressTime.append(charTime)
progress.update(index)
progress.draw(eta)
if conf.threads > 1 and isinstance(length, int) and length > 1:
value = [ None ] * length
index = [ firstChar ] # As list for python nested function scoping
idxlock = threading.Lock()
iolock = threading.Lock()
def downloadThread():
try:
while True:
idxlock.acquire()
if index[0] >= length:
idxlock.release()
return
index[0] += 1
curidx = index[0]
idxlock.release()
charStart = time.time()
val = getChar(curidx)
if val is None:
raise sqlmapValueException, "failed to get character at index %d (expected %d total)" % (curidx, length)
value[curidx-1] = val
if showEta:
etaProgressUpdate(time.time() - charStart, index[0])
elif conf.verbose >= 1:
s = "".join([c or "_" for c in value])
iolock.acquire()
dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), s))
iolock.release()
except (sqlmapConnectionException, sqlmapValueException), errMsg:
conf.threadException = True
logger.error("thread %d: %s" % (numThread + 1, errMsg))
except KeyboardInterrupt:
conf.threadException = True
print
logger.debug("waiting for threads to finish")
try:
while (threading.activeCount() > 1):
pass
except KeyboardInterrupt:
raise sqlmapThreadException, "user aborted"
except:
conf.threadException = True
errMsg = unhandledException()
logger.error("thread %d: %s" % (numThread + 1, errMsg))
traceback.print_exc()
# Start the threads
for numThread in range(numThreads):
thread = threading.Thread(target=downloadThread)
thread.start()
threads.append(thread)
# And wait for them to all finish
for thread in threads:
thread.join()
# If we have got one single character not correctly fetched it
# can mean that the connection to the target url was lost
if None in value:
for v in value:
if isinstance(v, str) and v is not None:
partialValue += v
if partialValue:
finalValue = partialValue
infoMsg = "\r[%s] [INFO] partially retrieved: %s" % (time.strftime("%X"), finalValue)
else:
finalValue = "".join(value)
infoMsg = "\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), finalValue)
if isinstance(finalValue, str) and len(finalValue) > 0:
dataToSessionFile(replaceNewlineTabs(finalValue))
if conf.verbose >= 1 and not showEta and infoMsg:
dataToStdout(infoMsg)
else:
index = firstChar
while True:
index += 1
charStart = time.time()
val = getChar(index, asciiTbl)
if val is None or ( lastChar > 0 and index > lastChar ):
break
finalValue += val
dataToSessionFile(replaceNewlineTabs(val))
if showEta:
etaProgressUpdate(time.time() - charStart, index)
elif conf.verbose >= 1:
dataToStdout(val)
if conf.verbose >= 1 or showEta:
dataToStdout("\n")
if ( conf.verbose in ( 1, 2 ) and showEta and len(str(progress)) >= 64 ) or conf.verbose >= 3:
infoMsg = "retrieved: %s" % finalValue
logger.info(infoMsg)
if not partialValue:
dataToSessionFile("]\n")
if conf.threadException:
raise sqlmapThreadException, "something unexpected happen into the threads"
return queriesCount[0], finalValue