sqlmap/lib/controller/checks.py
2010-11-29 14:30:57 +00:00

654 lines
23 KiB
Python

#!/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 socket
import time
from difflib import SequenceMatcher
from lib.core.agent import agent
from lib.core.common import beep
from lib.core.common import calculateDeltaSeconds
from lib.core.common import getUnicode
from lib.core.common import randomInt
from lib.core.common import randomStr
from lib.core.common import readInput
from lib.core.common import showStaticWords
from lib.core.common import wasLastRequestDBMSError
from lib.core.common import DynamicContentItem
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.data import paths
from lib.core.datatype import advancedDict
from lib.core.datatype import injectionDict
from lib.core.enums import HTTPMETHOD
from lib.core.enums import NULLCONNECTION
from lib.core.enums import PAYLOAD
from lib.core.exception import sqlmapConnectionException
from lib.core.exception import sqlmapGenericException
from lib.core.exception import sqlmapNoneDataException
from lib.core.exception import sqlmapSiteTooDynamic
from lib.core.exception import sqlmapUserQuitException
from lib.core.session import setString
from lib.core.session import setRegexp
from lib.core.settings import ERROR_SPACE
from lib.core.settings import ERROR_EMPTY_CHAR
from lib.request.connect import Connect as Request
from plugins.dbms.firebird.syntax import Syntax as Firebird
from plugins.dbms.postgresql.syntax import Syntax as PostgreSQL
from plugins.dbms.mssqlserver.syntax import Syntax as MSSQLServer
from plugins.dbms.oracle.syntax import Syntax as Oracle
from plugins.dbms.mysql.syntax import Syntax as MySQL
from plugins.dbms.access.syntax import Syntax as Access
from plugins.dbms.sybase.syntax import Syntax as Sybase
from plugins.dbms.sqlite.syntax import Syntax as SQLite
from plugins.dbms.maxdb.syntax import Syntax as MaxDB
def unescape(string, dbms):
unescaper = {
"Access": Access.unescape,
"Firebird": Firebird.unescape,
"MaxDB": MaxDB.unescape,
"Microsoft SQL Server": MSSQLServer.unescape,
"MySQL": MySQL.unescape,
"Oracle": Oracle.unescape,
"PostgreSQL": PostgreSQL.unescape,
"SQLite": SQLite.unescape,
"Sybase": Sybase.unescape
}
return unescaper[dbms](string)
def checkSqlInjection(place, parameter, value):
# Store here the details about boundaries and payload used to
# successfully inject
injection = injectionDict()
for test in conf.tests:
title = test.title
stype = test.stype
proceed = True
# Parse test's <risk>
if test.risk > conf.risk:
debugMsg = "skipping test '%s' because the risk " % title
debugMsg += "is higher than the provided"
logger.debug(debugMsg)
continue
# Parse test's <level>
if test.level > conf.level:
debugMsg = "skipping test '%s' because the level " % title
debugMsg += "is higher than the provided"
logger.debug(debugMsg)
continue
if "details" in test and "dbms" in test.details:
dbms = test.details.dbms
else:
dbms = None
# Skip current test if it is the same SQL injection type
# already identified by another test
if injection.data and stype in injection.data:
debugMsg = "skipping test '%s' because " % title
debugMsg += "we have already the payload for %s" % PAYLOAD.SQLINJECTION[stype]
logger.debug(debugMsg)
continue
# Skip DBMS-specific tests if they do not match the DBMS
# identified
if injection.dbms is not None and injection.dbms != dbms:
debugMsg = "skipping test '%s' because " % title
debugMsg += "the back-end DBMS is %s" % injection.dbms
logger.debug(debugMsg)
continue
infoMsg = "testing '%s'" % title
logger.info(infoMsg)
# Parse test's <request>
payload = agent.cleanupPayload(test.request.payload)
if dbms:
payload = unescape(payload, dbms)
if "comment" in test.request:
comment = test.request.comment
else:
comment = ""
testPayload = "%s%s" % (payload, comment)
if conf.prefix is not None and conf.suffix is not None:
# Create a custom boundary object for user's supplied prefix
# and suffix
boundary = advancedDict()
boundary.level = 1
boundary.clause = [ 0 ]
boundary.where = [ 1, 2, 3 ]
boundary.prefix = conf.prefix
boundary.suffix = conf.suffix
if "like" in boundary.suffix.lower():
if "'" in boundary.suffix.lower():
boundary.ptype = 3
elif '"' in boundary.suffix.lower():
boundary.ptype = 5
elif "'" in boundary.suffix.lower():
boundary.ptype = 2
elif '"' in boundary.suffix.lower():
boundary.ptype = 4
else:
boundary.ptype = 1
# Prepend user's provided boundaries to all others
conf.boundaries.insert(0, boundary)
for boundary in conf.boundaries:
# Parse boundary's <level>
if boundary.level > conf.level:
# NOTE: shall we report every single skipped boundary too?
continue
# Parse test's <clause> and boundary's <clause>
# Skip boundary if it does not match against test's <clause>
clauseMatch = False
for clauseTest in test.clause:
if clauseTest in boundary.clause:
clauseMatch = True
break
if test.clause != [ 0 ] and boundary.clause != [ 0 ] and not clauseMatch:
continue
# Parse test's <where> and boundary's <where>
# Skip boundary if it does not match against test's <where>
whereMatch = False
for where in test.where:
if where in boundary.where:
whereMatch = True
break
if not whereMatch:
continue
# Parse boundary's <prefix>, <suffix> and <ptype>
prefix = boundary.prefix if boundary.prefix else ""
suffix = boundary.suffix if boundary.suffix else ""
ptype = boundary.ptype
injectable = False
# If the previous injections succeeded, we know which prefix,
# postfix and parameter type to use for further tests, no
# need to cycle through all of the boundaries anymore
condBound = (injection.prefix is not None and injection.suffix is not None)
condBound &= (injection.prefix != prefix or injection.suffix != suffix)
condType = injection.ptype is not None and injection.ptype != ptype
if condBound or condType:
continue
# For each test's <where>
for where in test.where:
# The <where> tag defines where to add our injection
# string to the parameter under assessment.
if where == 1:
origValue = value
elif where == 2:
origValue = "-%s" % value
elif where == 3:
origValue = ""
# Forge payload by prepending with boundary's prefix and
# appending with boundary's suffix the test's
# ' <payload><command> ' string
boundPayload = "%s%s %s %s" % (origValue, prefix, testPayload, suffix)
boundPayload = boundPayload.strip()
boundPayload = agent.cleanupPayload(boundPayload)
reqPayload = agent.payload(place, parameter, value, boundPayload)
# Parse test's <response>
# Check wheather or not the payload was successful
for method, check in test.response.items():
check = agent.cleanupPayload(check)
# In case of boolean-based blind SQL injection
if method == "comparison":
sndPayload = agent.cleanupPayload(test.response.comparison)
if dbms:
sndPayload = unescape(sndPayload, dbms)
if "comment" in test.response:
sndComment = test.response.comment
else:
sndComment = ""
sndPayload = "%s%s" % (sndPayload, sndComment)
boundPayload = "%s%s %s %s" % (origValue, prefix, sndPayload, suffix)
boundPayload = boundPayload.strip()
boundPayload = agent.cleanupPayload(boundPayload)
cmpPayload = agent.payload(place, parameter, value, boundPayload)
# Useful to set conf.matchRatio at first
conf.matchRatio = None
_ = Request.queryPage(cmpPayload, place)
trueResult = Request.queryPage(reqPayload, place)
if trueResult:
falseResult = Request.queryPage(cmpPayload, place)
if not falseResult:
infoMsg = "%s parameter '%s' is '%s' injectable " % (place, parameter, title)
logger.info(infoMsg)
kb.paramMatchRatio[(place, parameter)] = conf.matchRatio
injectable = True
kb.paramMatchRatio[(place, parameter)] = conf.matchRatio
# In case of error-based or UNION query SQL injections
elif method == "grep":
reqBody, _ = Request.queryPage(reqPayload, place, content=True)
match = re.search(check, reqBody, re.DOTALL | re.IGNORECASE)
if not match:
continue
output = match.group('result')
if output:
output = output.replace(ERROR_SPACE, " ").replace(ERROR_EMPTY_CHAR, "")
if output == "1":
infoMsg = "%s parameter '%s' is '%s' injectable " % (place, parameter, title)
logger.info(infoMsg)
injectable = True
# In case of time-based blind or stacked queries SQL injections
elif method == "time":
start = time.time()
_ = Request.queryPage(reqPayload, place)
duration = calculateDeltaSeconds(start)
if duration >= conf.timeSec:
infoMsg = "%s parameter '%s' is '%s' injectable " % (place, parameter, title)
logger.info(infoMsg)
injectable = True
if injectable is True:
injection.place = place
injection.parameter = parameter
injection.ptype = ptype
injection.prefix = prefix
injection.suffix = suffix
injection.data[stype] = (boundPayload, comment)
if "details" in test:
for detailKey, detailValue in test.details.items():
if detailKey == "dbms" and injection.dbms is None:
injection.dbms = detailValue
elif detailKey == "dbms_version" and injection.dbms_version is None:
injection.dbms_version = detailValue
elif detailKey == "os" and injection.os is None:
injection.os = detailValue
break
if injection.place is not None and injection.parameter is not None:
return injection
else:
return None
def heuristicCheckSqlInjection(place, parameter, value):
if kb.nullConnection:
debugMsg = "heuristic checking skipped "
debugMsg += "because NULL connection used"
logger.debug(debugMsg)
return
prefix = ""
suffix = ""
if conf.prefix or conf.suffix:
if conf.prefix:
prefix = conf.prefix
if conf.suffix:
suffix = conf.suffix
payload = "%s%s%s%s" % (value, prefix, randomStr(length=10, alphabet=['"', '\'', ')', '(']), suffix)
payload = agent.payload(place, parameter, value, payload)
Request.queryPage(payload, place, raise404=False)
result = wasLastRequestDBMSError()
infoMsg = "heuristics shows that %s " % place
infoMsg += "parameter '%s' might " % parameter
if result:
infoMsg += "be injectable (possible DBMS: %s)" % (kb.htmlFp[-1] if kb.htmlFp else 'Unknown')
logger.info(infoMsg)
else:
infoMsg += "not be injectable"
logger.warning(infoMsg)
def checkDynParam(place, parameter, value):
"""
This function checks if the url parameter is dynamic. If it is
dynamic, the content of the page differs, otherwise the
dynamicity might depend on another parameter.
"""
conf.matchRatio = None
infoMsg = "testing if %s parameter '%s' is dynamic" % (place, parameter)
logger.info(infoMsg)
randInt = randomInt()
payload = agent.payload(place, parameter, value, getUnicode(randInt))
dynResult = Request.queryPage(payload, place)
if True == dynResult:
return False
infoMsg = "confirming that %s parameter '%s' is dynamic" % (place, parameter)
logger.info(infoMsg)
randInt = randomInt()
payload = agent.payload(place, parameter, value, getUnicode(randInt))
dynResult = Request.queryPage(payload, place)
return not dynResult
def checkDynamicContent(firstPage, secondPage):
"""
This function checks if the provided pages have dynamic content. If they
are dynamic, proper markings will be made.
"""
if kb.nullConnection:
debugMsg = "dynamic content checking skipped "
debugMsg += "because NULL connection used"
logger.debug(debugMsg)
return
if conf.longestCommon:
debugMsg = "dynamic content checking skipped "
debugMsg += "because longest common comparison used"
logger.debug(debugMsg)
return
infoMsg = "searching for dynamic content"
logger.info(infoMsg)
blocks = SequenceMatcher(None, firstPage, secondPage).get_matching_blocks()
kb.dynamicMarkings = []
i = 0
while i < len(blocks):
block = blocks[i]
(_, _, length) = block
if length <= conf.minMatchBlock:
blocks.remove(block)
else:
i += 1
if len(blocks) > 0:
blocks.insert(0, None)
blocks.append(None)
for i in xrange(len(blocks) - 1):
prefix = firstPage[blocks[i][0]:blocks[i][0] + blocks[i][2]] if blocks[i] else None
suffix = firstPage[blocks[i + 1][0]:blocks[i + 1][0] + blocks[i + 1][2]] if blocks[i + 1] else None
if prefix is None and blocks[i + 1][0] == 0:
continue
if suffix is None and (blocks[i][0] + blocks[i][2] >= len(firstPage)):
continue
while prefix and prefix[-1].isalnum():
prefix = prefix[:-1]
while suffix and suffix[0].isalnum():
suffix = suffix[1:]
kb.dynamicMarkings.append((re.escape(prefix[-conf.dynMarkLength:]) if prefix else None, re.escape(suffix[:conf.dynMarkLength]) if suffix else None))
if len(kb.dynamicMarkings) > 0:
infoMsg = "dynamic content marked for removal (%d region%s)" % (len(kb.dynamicMarkings), 's' if len(kb.dynamicMarkings) > 1 else '')
logger.info(infoMsg)
if conf.seqMatcher.a:
for item in kb.dynamicMarkings:
prefix, suffix = item
if prefix is None:
conf.seqMatcher.a = re.sub('(?s)^.+%s' % suffix, suffix, conf.seqMatcher.a)
elif suffix is None:
conf.seqMatcher.a = re.sub('(?s)%s.+$' % prefix, prefix, conf.seqMatcher.a)
else:
conf.seqMatcher.a = re.sub('(?s)%s.+%s' % (prefix, suffix), '%s%s' % (prefix, suffix), conf.seqMatcher.a)
def checkStability():
"""
This function checks if the URL content is stable requesting the
same page two times with a small delay within each request to
assume that it is stable.
In case the content of the page differs when requesting
the same page, the dynamicity might depend on other parameters,
like for instance string matching (--string).
"""
infoMsg = "testing if the url is stable, wait a few seconds"
logger.info(infoMsg)
firstPage = conf.seqMatcher.a # set inside checkConnection()
time.sleep(1)
secondPage, _ = Request.queryPage(content=True)
kb.pageStable = (firstPage == secondPage)
if kb.pageStable:
if firstPage:
logMsg = "url is stable"
logger.info(logMsg)
else:
errMsg = "there was an error checking the stability of page "
errMsg += "because of lack of content. please check the "
errMsg += "page request results (and probable errors) by "
errMsg += "using higher verbosity levels"
raise sqlmapNoneDataException, errMsg
else:
warnMsg = "url is not stable, sqlmap will base the page "
warnMsg += "comparison on a sequence matcher. If no dynamic nor "
warnMsg += "injectable parameters are detected, or in case of "
warnMsg += "junk results, refer to user's manual paragraph "
warnMsg += "'Page comparison' and provide a string or regular "
warnMsg += "expression to match on"
logger.warn(warnMsg)
message = "how do you want to proceed? [C(ontinue)/s(tring)/r(egex)/q(uit)] "
test = readInput(message, default="C")
if test and test[0] in ("q", "Q"):
raise sqlmapUserQuitException
elif test and test[0] in ("s", "S"):
showStaticWords(firstPage, secondPage)
message = "please enter value for parameter 'string': "
test = readInput(message)
if test:
conf.string = test
if kb.nullConnection:
debugMsg = "turning off NULL connection "
debugMsg += "support because of string checking"
logger.debug(debugMsg)
kb.nullConnection = None
else:
errMsg = "Empty value supplied"
raise sqlmapNoneDataException, errMsg
elif test and test[0] in ("r", "R"):
message = "please enter value for parameter 'regex': "
test = readInput(message)
if test:
conf.regex = test
if kb.nullConnection:
debugMsg = "turning off NULL connection "
debugMsg += "support because of regex checking"
logger.debug(debugMsg)
kb.nullConnection = None
else:
errMsg = "Empty value supplied"
raise sqlmapNoneDataException, errMsg
else:
checkDynamicContent(firstPage, secondPage)
if not Request.queryPage():
errMsg = "target url is too dynamic. unable to continue. "
errMsg += "consider using other switches (e.g. "
errMsg += "--longest-common, --string, --text-only, etc.)"
raise sqlmapSiteTooDynamic, errMsg
return kb.pageStable
def checkString():
if not conf.string:
return True
condition = (
kb.resumedQueries.has_key(conf.url) and
kb.resumedQueries[conf.url].has_key("String") and
kb.resumedQueries[conf.url]["String"][:-1] == conf.string
)
if condition:
return True
infoMsg = "testing if the provided string is within the "
infoMsg += "target URL page content"
logger.info(infoMsg)
page, _ = Request.queryPage(content=True)
if conf.string in page:
setString()
else:
warnMsg = "you provided '%s' as the string to " % conf.string
warnMsg += "match, but such a string is not within the target "
warnMsg += "URL page content original request, sqlmap will "
warnMsg += "keep going anyway"
logger.warn(warnMsg)
return True
def checkRegexp():
if not conf.regexp:
return True
condition = (
kb.resumedQueries.has_key(conf.url) and
kb.resumedQueries[conf.url].has_key("Regular expression") and
kb.resumedQueries[conf.url]["Regular expression"][:-1] == conf.regexp
)
if condition:
return True
infoMsg = "testing if the provided regular expression matches within "
infoMsg += "the target URL page content"
logger.info(infoMsg)
page, _ = Request.queryPage(content=True)
if re.search(conf.regexp, page, re.I | re.M):
setRegexp()
else:
warnMsg = "you provided '%s' as the regular expression to " % conf.regexp
warnMsg += "match, but such a regular expression does not have any "
warnMsg += "match within the target URL page content, sqlmap "
warnMsg += "will keep going anyway"
logger.warn(warnMsg)
return True
def checkNullConnection():
"""
Reference: http://www.wisec.it/sectou.php?id=472f952d79293
"""
infoMsg = "testing NULL connection to the target url"
logger.info(infoMsg)
try:
page, headers = Request.getPage(method=HTTPMETHOD.HEAD)
if not page and 'Content-Length' in headers:
kb.nullConnection = NULLCONNECTION.HEAD
infoMsg = "NULL connection is supported with HEAD header"
logger.info(infoMsg)
else:
page, headers = Request.getPage(auxHeaders={"Range": "bytes=-1"})
if page and len(page) == 1 and 'Content-Range' in headers:
kb.nullConnection = NULLCONNECTION.RANGE
infoMsg = "NULL connection is supported with GET header "
infoMsg += "'%s'" % kb.nullConnection
logger.info(infoMsg)
except sqlmapConnectionException, errMsg:
errMsg = getUnicode(errMsg)
raise sqlmapConnectionException, errMsg
return kb.nullConnection is not None
def checkConnection(suppressOutput=False):
try:
socket.gethostbyname(conf.hostname)
except socket.gaierror:
errMsg = "host '%s' does not exist" % conf.hostname
raise sqlmapConnectionException, errMsg
if not suppressOutput:
infoMsg = "testing connection to the target url"
logger.info(infoMsg)
try:
page, _ = Request.queryPage(content=True)
conf.seqMatcher.set_seq1(page)
except sqlmapConnectionException, errMsg:
errMsg = getUnicode(errMsg)
raise sqlmapConnectionException, errMsg
return True