ft@22: #!/usr/bin/python
ft@22: 
ft@22: # ------------------------------------------------------------
ft@22: # opensecurity package file
ft@22: #
ft@22: # Autor:  Karlberger Christoph <Karlberger.C@ikarus.at>
ft@22: #         X-Net Services GmbH <office@x-net.at>
ft@22: #
ft@22: # Copyright 2013-2014 X-Net and AIT Austrian Institute of Technology
ft@22: #
ft@22: #     IKARUS Security Software GmbH
ft@22: #     Blechturmgasse 11
ft@22: #     1050 Wien
ft@22: #     AUSTRIA
ft@22: #     http://www.ikarussecurity.com
ft@22: #
ft@22: #     X-Net Technologies GmbH
ft@22: #     Elisabethstrasse 1
ft@22: #     4020 Linz
ft@22: #     AUSTRIA
ft@22: #     https://www.x-net.at
ft@22: #
ft@22: #     AIT Austrian Institute of Technology
ft@22: #     Donau City Strasse 1
ft@22: #     1220 Wien
ft@22: #     AUSTRIA
ft@22: #     http://www.ait.ac.at
ft@22: #
ft@22: #
ft@22: # Licensed under the Apache License, Version 2.0 (the "License");
ft@22: # you may not use this file except in compliance with the License.
ft@22: # You may obtain a copy of the License at
ft@22: #
ft@22: #    http://www.apache.org/licenses/LICENSE-2.0
ft@22: #
ft@22: # Unless required by applicable law or agreed to in writing, software
ft@22: # distributed under the License is distributed on an "AS IS" BASIS,
ft@22: # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ft@22: # See the License for the specific language governing permissions and
ft@22: # limitations under the License.
ft@22: # ------------------------------------------------------------
ft@22: 
ft@22: import ConfigParser
ft@22: 
ft@22: import sys
ft@22: 
ft@22: import logging
ft@22: import os
ft@22: import errno
ft@22: import time
ft@22: 
ft@22: import urllib3
ft@22: import xml.etree.ElementTree as ET
ft@22: 
ft@22: class IkarusScanner:
ft@22:     
ft@22:     # User the existing logger  instance
ft@22:     __LOG = logging.getLogger("IkarusScanner")
ft@22:     
ft@22:     __MINOPTS = { "Main" : ["LocalScanserverURL", "RemoteScanserverURL", "MaxFileSize", "RetryTimeout"]}
ft@22:     __CONFIG_NOT_READABLE = "Configfile is not readable"
ft@22:     __CONFIG_WRONG = "Something is wrong with the config"
ft@22:     __CONFIG_MISSING = "Section: \"%s\" Option: \"%s\" in configfile is missing"
ft@22:     __LOCAL_SCANSERVER_URL = ""
ft@22:     __REMOTE_SCANSERVER_URL = ""
ft@22:     __STATUS_CODE_OK = 200
ft@22:     __STATUS_CODE_INFECTED = 210
ft@22:     __STATUS_CODE_NOT_FOUND = 404
ft@22:     __MAX_SCAN_FILE_SIZE = 50 * 0x100000
ft@22:     __SCANSERVER_RETRY_TIMEOUT = 60
ft@22:     
ft@22:     # Global http pool manager used to connect to the scan server
ft@22:     __remoteScanserverReachable = True
ft@22:     __scanserverTimestamp = 0
ft@22:     __httpPool = urllib3.PoolManager(num_pools = 1, timeout = 3)
ft@22:     
ft@22:     def __init__ (self, scanner_config_path):
ft@22:         config = self.loadConfig (scanner_config_path)
ft@22:     
ft@22:         self.__scanserverTimestamp = time.time()
ft@22:     
ft@22:         self.__LOCAL_SCANSERVER_URL = config.get("Main", "LocalScanserverURL")
ft@22:         self.__REMOTE_SCANSERVER_URL = config.get("Main", "RemoteScanserverURL")
ft@22:         self.__SCANSERVER_RETRY_TIMEOUT = int(config.get("Main", "RetryTimeout"))
ft@22:     
ft@22:         # Convert file size from MB to byte
ft@22:         self.__MAX_SCAN_FILE_SIZE = int(config.get("Main", "MaxFileSize")) * 0x100000
ft@22:     
ft@22: 
ft@22:     def checkMinimumOptions (self, config):
ft@22:         for section, options in self.__MINOPTS.iteritems ():
ft@22:             for option in options:
ft@22:                 if (config.has_option(section, option) == False):
ft@22:                     self.__LOG.error (self.__CONFIG_MISSING % (section, option))
ft@22:                     exit (129)
ft@22: 
ft@22:     def loadConfig (self, scanner_config_path):
ft@22: 
ft@22:         configfile = scanner_config_path
ft@22:         config = ConfigParser.SafeConfigParser ()
ft@22:     
ft@22:         if ((os.path.exists (scanner_config_path) == False) or (os.path.isfile (scanner_config_path) == False) or (os.access (scanner_config_path, os.R_OK) == False)):
ft@22:             self.__LOG.error(self.__CONFIG_NOT_READABLE);
ft@22:             raise SystemError(self.__CONFIG_NOT_READABLE)
ft@22:     
ft@22:         try:
ft@22:             config.read (scanner_config_path)
ft@22:         except Exception, e:
ft@22:             self.__LOG.error("Error: %s" % (e));
ft@22:             raise SystemError("Error: %s" % (e))
ft@22: 
ft@22:         self.checkMinimumOptions (config)
ft@22:     
ft@22:         return config
ft@22: 
ft@22:     def contactScanserver(self, url, fields):
ft@22:         self.__LOG.debug("Contacting server %s" % url)
ft@22:         return self.__httpPool.request_encode_body('POST', url, fields = fields, retries = 0)
ft@22:     
ft@22:     def scanFile (self, path, fileobject):
ft@22:         return self.scanFileIkarus (path, fileobject)
ft@22: 
ft@22:     def scanFileIkarus (self, path, fileobject):
ft@22:         retval = { "infected" : False, "virusname" : "Unknown" }
ft@22:         self.__LOG.debug ("Scan File: %s" % (path))
ft@22:     
ft@22:         if (os.fstat(fileobject.fileno()).st_size > self.__MAX_SCAN_FILE_SIZE):
ft@22:             self.__LOG.info("File max size exceeded. The file is not scanned.")
ft@22:             retval["infected"] = False
ft@22:             retval["virusname"] = "File is to big to be scanned."
ft@22:             return retval
ft@22:     
ft@22:         fields = { 'up_file' : fileobject.read() }
ft@22:     
ft@22:         if (self.__remoteScanserverReachable == False) and ((self.__scanserverTimestamp + self.__SCANSERVER_RETRY_TIMEOUT) < time.time()):
ft@22:             self.__remoteScanserverReachable = True
ft@22:     
ft@22:         if self.__remoteScanserverReachable:
ft@22:             try:
ft@22:                 response = self.contactScanserver(self.__REMOTE_SCANSERVER_URL, fields)
ft@22:                 # We should catch socket.error here, but this does not work. Needs checking.
ft@22:             except:
ft@22:                 self.__LOG.info("Remote scan server unreachable, using local scan server.")
ft@22:                 self.__LOG.debug("Exception: %s: %s" % (sys.exc_info()[0], sys.exc_info()[1]))
ft@22:                 self.__LOG.info("Next check for remote server in %s seconds." % (self.__SCANSERVER_RETRY_TIMEOUT))
ft@22:                 
ft@22:                 self.__remoteScanserverReachable = False
ft@22:                 self.__scanserverTimestamp = time.time()
ft@22:     
ft@22:                 try:
ft@22:                     response = self.contactScanserver(self.__LOCAL_SCANSERVER_URL, fields)
ft@22:                 except:
ft@22:                     self.__LOG.error ("Connection to local scan server could not be established.")
ft@22:                     self.__LOG.debug ("Exception: %s" % (sys.exc_info()[0]))
ft@22:                     return retval
ft@22:         else:
ft@22:             try:
ft@22:                 response = self.contactScanserver(self.__LOCAL_SCANSERVER_URL, fields)
ft@22:             except:
ft@22:                 self.__LOG.error ("Connection to local scan server could not be established.")
ft@22:                 self.__LOG.error ("Exception: %s" %(sys.exc_info()[0]))
ft@22:                 return retval
ft@22:         
ft@22:     
ft@22:         if response.status == self.__STATUS_CODE_OK:
ft@22:             retval["infected"] = False
ft@22:         elif response.status == self.__STATUS_CODE_INFECTED:
ft@22:             # Parse xml for info
ft@22:             root = ET.fromstring(response.data)
ft@22:             
ft@22:             # this should be done in a more generic way
ft@22:             retval["virusname"] = root[1][3][0].text
ft@22:             retval["infected"] = True
ft@22:         else:
ft@22:             self.__LOG.error ("Connection error to scan server.")
ft@22:     
ft@22:         if (retval["infected"] == True):
ft@22:             self.__LOG.error ("Virus found, denying access.")
ft@22:         else:
ft@22:             self.__LOG.debug ("No virus found.")
ft@22:         
ft@22:         return retval
ft@22: 
ft@22:     
ft@22: