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# -*- coding: UTF-8 -*-
# Copyright 2012-2018 Fumail Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#
#
"""
This plugin allows to reject mails based on the location of the sending server.
Set a blacklist to reject mail from specific countries.
Set a whitelist to accept mail from specific countries only, mail from all other countries will be rejected.
The python pygeoip module and the GeoIP-database from MaxMind are required.
"""
import os
from postomaat.shared import ScannerPlugin, DUNNO, REJECT, apply_template, FileList
LIB_GEOIP_NONE = 0
LIB_GEOIP_PYGEOIP = 1
LIB_GEOIP_MAXMIND = 2
try:
import pygeoip
HAVE_GEOIP = LIB_GEOIP_PYGEOIP
except ImportError:
pygeoip = None
try:
import GeoIP
HAVE_GEOIP = LIB_GEOIP_MAXMIND
except ImportError:
GeoIP = None
HAVE_GEOIP = LIB_GEOIP_NONE
class PyGeoIPCache(FileList):
def __init__(self, filename, **kw):
FileList.__init__(self, filename, **kw)
self.geoip = None
def _reload(self):
self.geoip = pygeoip.GeoIP(self.filename)
self.logger.debug('loaded geoip database %s' % self.filename)
def country_code(self, ip):
self._reload_if_necessary()
try:
cc = self.geoip.country_code_by_addr(ip)
except Exception as e:
self.logger.debug('Failed to get country code for %s: %s' % (ip, str(e)))
cc = None
return cc
def country_name(self, cc):
self._reload_if_necessary()
country = 'unknown'
if cc:
i = pygeoip.const.COUNTRY_CODES.index(cc)
country = pygeoip.const.COUNTRY_NAMES[i]
return country
class GeoIPCache(PyGeoIPCache):
def _reload(self):
self.geoip = GeoIP.open(self.filename, GeoIP.GEOIP_STANDARD)
self.logger.debug('loaded geoip database %s' % self.filename)
def country_name(self, cc):
self._reload_if_necessary()
country = 'unknown'
if cc:
cc = cc.upper()
if cc in GeoIP.country_names:
country = GeoIP.country_names[cc]
return country
class GeoIPPlugin(ScannerPlugin):
def __init__(self,config,section=None):
ScannerPlugin.__init__(self,config,section)
self.logger=self._logger()
if HAVE_GEOIP == LIB_GEOIP_PYGEOIP:
self.geoip = PyGeoIPCache(None)
elif HAVE_GEOIP == LIB_GEOIP_MAXMIND:
self.geoip = GeoIPCache(None)
else:
self.geoip = None
self.requiredvars={
'database':{
'default':'/var/lib/geoip/GeoIP.dat',
'description':'location of the MaxMind GeopIP database file',
},
'blacklist':{
'default':'',
'description':'list of countries you do not want to receive mail from.',
},
'whitelist':{
'default':'',
'description':'list of countries you want want to receive mail from. all other countries will be rejected. If you specify a whitelist, the blacklist will have no function.',
},
'on_unknown':{
'default':'DUNNO',
'description':'what to do with unknown countries? this affects local IP-addresses. Set this to DUNNO or REJECT',
},
'reject_message':{
'default':'this system does not accept mail from servers in your country "${cn}" - request whitelisting',
'description':'message displayed to client on reject. use ${cc} as placeholder for country code and ${cn} for English country name',
},
}
def _get_list(self, list_type='blacklist'):
data = self.config.get(self.section, list_type).strip()
mylist = []
if data:
sep = ' '
if ',' in data:
sep = ','
mylist = [i.strip() for i in data.split(sep)]
return mylist
def examine(self,suspect):
if HAVE_GEOIP == LIB_GEOIP_NONE:
return DUNNO
database = self.config.get(self.section, 'database')
if not os.path.exists(database):
return DUNNO
self.geoip.filename = database
client_address=suspect.get_value('client_address')
if client_address is None:
self.logger.info('No client address found')
return DUNNO
blacklist = self._get_list('blacklist')
whitelist = self._get_list('whitelist')
on_unknown = self.config.get(self.section, 'on_unknown')
unknown = DUNNO
if on_unknown.strip().upper() == 'REJECT':
unknown = REJECT
cc = self.geoip.country_code(client_address)
cn = self.geoip.country_name(cc)
action = DUNNO
message = None
if cn == 'unknown':
action = unknown
elif cc in blacklist or (whitelist and cc not in whitelist):
action = REJECT
if action == REJECT:
rejmsg = self.config.get(self.section, 'reject_message').strip()
message = apply_template(rejmsg, suspect, dict(cn=cn, cc=cc))
self.logger.debug('IP: %s country: %s action: %s' % (client_address, cc, action))
return action, message
def lint(self):
lint_ok = True
if HAVE_GEOIP == LIB_GEOIP_NONE:
print('No geoip module installed - this plugin will do nothing')
lint_ok = False
elif HAVE_GEOIP == LIB_GEOIP_PYGEOIP:
print('using pygeoip')
elif HAVE_GEOIP == LIB_GEOIP_MAXMIND:
print('using maxmind geoip')
database = self.config.get(self.section, 'database')
if not os.path.exists(database):
print('Could not find geoip database file - this plugin will do nothing')
lint_ok = False
else:
print('Using GeoIP Database in %s' % database)
if lint_ok:
testip = '8.8.8.8'
self.geoip.filename = database
cc = self.geoip.country_code(testip)
cn = self.geoip.country_name(cc)
print('Test IP %s is located in %s (%s)' % (testip, cc, cn))
if not self.checkConfig():
print('Error checking config')
lint_ok = False
blacklist = self._get_list('blacklist')
whitelist = self._get_list('whitelist')
if not blacklist and not whitelist:
print('Neither black nor white list defined')
lint_ok = False
elif blacklist and whitelist:
print('Black and white list defined - only using blacklist')
lint_ok = False
else:
print('Blacklist: %s' % blacklist)
print('Whitelist: %s' % whitelist)
return lint_ok
def __str__(self):
return "GeoIPPlugin"