Firewall on Demand

# -*- coding: utf-8 -*- vim:encoding=utf-8:

# vim: tabstop=4:shiftwidth=4:softtabstop=4:expandtab

from django.db import models

from django.conf import settings

from django.contrib.auth.models import User

from utils import proxy as PR

from ipaddr import *

from datetime import *

import logging

from flowspec.tasks import *

from time import sleep

FORMAT = '%(asctime)s %(levelname)s: %(message)s'

logging.basicConfig(format=FORMAT)

logger = logging.getLogger(__name__)

logger.setLevel(logging.DEBUG)

FRAGMENT_CODES = (

    ("dont-fragment", "Don't fragment"),

    ("first-fragment", "First fragment"),

    ("is-fragment", "Is fragment"),

    ("last-fragment", "Last fragment"),

    ("not-a-fragment", "Not a fragment")

)

THEN_CHOICES = (

    ("accept", "Accept"),

    ("discard", "Discard"),

    ("community", "Community"),

    ("next-term", "Next term"),

    ("routing-instance", "Routing Instance"),

    ("rate-limit", "Rate limit"),

    ("sample", "Sample")                

)

def days_offset(): return datetime.now() + timedelta(days = settings.EXPIRATION_DAYS_OFFSET)

class MatchPort(models.Model):

    port = models.CharField(max_length=24)

    def __unicode__(self):

        return self.port

    class Meta:

        db_table = u'match_port'    

class MatchDscp(models.Model):

    dscp = models.CharField(max_length=24)

    def __unicode__(self):

        return self.dscp

    class Meta:

        db_table = u'match_dscp'

class ThenAction(models.Model):

    action = models.CharField(max_length=60, choices=THEN_CHOICES, verbose_name="Action")

    action_value = models.CharField(max_length=255, blank=True, null=True, verbose_name="Action Value")

    def __unicode__(self):

        return "%s: %s" %(self.action, self.action_value)

    class Meta:

        db_table = u'then_action'

class Route(models.Model):

    name = models.SlugField(max_length=128)

    applier = models.ForeignKey(User, blank=True, null=True)

    source = models.CharField(max_length=32, blank=True, null=True, help_text=u"Network address. Use address/CIDR notation", verbose_name="Source Address")

    sourceport = models.ManyToManyField(MatchPort, blank=True, null=True, related_name="matchSourcePort", verbose_name="Source Port")

    destination = models.CharField(max_length=32, help_text=u"Network address. Use address/CIDR notation", verbose_name="Destination Address")

    destinationport = models.ManyToManyField(MatchPort, blank=True, null=True, related_name="matchDestinationPort", verbose_name="Destination Port")

    port = models.ManyToManyField(MatchPort, blank=True, null=True, related_name="matchPort", verbose_name="Port" )

    dscp = models.ManyToManyField(MatchDscp, blank=True, null=True, verbose_name="DSCP")

    fragmenttype = models.CharField(max_length=20, choices=FRAGMENT_CODES, blank=True, null=True, verbose_name="Fragment Type")

    icmpcode = models.CharField(max_length=32, blank=True, null=True, verbose_name="ICMP Code")

    icmptype = models.CharField(max_length=32, blank=True, null=True, verbose_name="ICMP Type")

    packetlength = models.IntegerField(blank=True, null=True, verbose_name="Packet Length")

    protocol = models.CharField(max_length=32, blank=True, null=True, verbose_name="Protocol")

    tcpflag = models.CharField(max_length=128, blank=True, null=True, verbose_name="TCP flag")

    then = models.ManyToManyField(ThenAction, verbose_name="Then")

    filed = models.DateTimeField(auto_now_add=True)

    last_updated = models.DateTimeField(auto_now=True)

    is_online = models.BooleanField(default=False)

    is_active = models.BooleanField(default=False)

    expires = models.DateField(default=days_offset, blank=True, null=True,)

    response = models.CharField(max_length=512, blank=True, null=True)

    comments = models.TextField(null=True, blank=True, verbose_name="Comments")

    def __unicode__(self):

        return self.name

    class Meta:

        unique_together = (("name", "is_active"),)

        db_table = u'route'

    def clean(self, *args, **kwargs):

        from django.core.exceptions import ValidationError

        if self.destination:

            try:

                address = IPNetwork(self.destination)

                self.destination = address.exploded

            except Exception:

                raise ValidationError('Invalid network address format at Destination Field')

        if self.source:

            try:

                address = IPNetwork(self.source)

                self.source = address.exploded

            except Exception:

                raise ValidationError('Invalid network address format at Source Field')

#    def save(self, *args, **kwargs):

#        edit = False

#        if self.pk:

#            #This is an edit

#            edit = True

#        super(Route, self).save(*args, **kwargs)

#        if not edit:

#            response = add.delay(self)

#            logger.info("Got save job id: %s" %response)

    def commit_add(self, *args, **kwargs):

        response = add.delay(self)

        logger.info("Got save job id: %s" %response)

#    

#    def delete(self, *args, **kwargs):

#        response = delete.delay(self)

#        logger.info("Got delete job id: %s" %response)

    def is_synced(self):

        found = False

        get_device = PR.Retriever()

        device = get_device.fetch_device()

        try:

            routes = device.routing_options[0].routes

        except Exception as e:

            self.is_online = False

            self.save()

            logger.error("No routing options on device. Exception: %s" %e)

            return False

        for route in routes:

            if route.name == self.name:

                found = True

                logger.info('Found a matching route name')

                devicematch = route.match

                try:

                    assert(self.destination)

                    assert(devicematch['destination'][0])

                    if self.destination == devicematch['destination'][0]:

                        found = found and True

                        logger.info('Found a matching destination')

                    else:

                        found = False

                        logger.info('Destination fields do not match')

                except:

                    pass

                try:

                    assert(self.source)

                    assert(devicematch['source'][0])

                    if self.source == devicematch['source'][0]:

                        found = found and True

                        logger.info('Found a matching source')

                    else:

                        found = False

                        logger.info('Source fields do not match')

                except:

                    pass

                try:

                    assert(self.fragmenttype)

                    assert(devicematch['fragment'][0])

                    if self.fragmenttype == devicematch['fragment'][0]:

                        found = found and True

                        logger.info('Found a matching fragment type')

                    else:

                        found = False

                        logger.info('Fragment type fields do not match')

                except:

                    pass

                try:

                    assert(self.icmpcode)

                    assert(devicematch['icmp-code'][0])

                    if self.icmpcode == devicematch['icmp-code'][0]:

                        found = found and True

                        logger.info('Found a matching icmp code')

                    else:

                        found = False

                        logger.info('Icmp code fields do not match')

                except:

                    pass

                try:

                    assert(self.icmptype)

                    assert(devicematch['icmp-type'][0])

                    if self.icmptype == devicematch['icmp-type'][0]:

                        found = found and True

                        logger.info('Found a matching icmp type')

                    else:

                        found = False

                        logger.info('Icmp type fields do not match')

                except:

                    pass

                try:

                    assert(self.protocol)

                    assert(devicematch['protocol'][0])

                    if self.protocol == devicematch['protocol'][0]:

                        found = found and True

                        logger.info('Found a matching protocol')

                    else:

                        found = False

                        logger.info('Protocol fields do not match')

                except:

                    pass

                if found and not self.is_online:

                     logger.error('Rule is applied on device but appears as offline')

                     found = False

        return found

    def get_then(self):

        ret = ''

        then_statements = self.then.all()

        for statement in then_statements:

            if statement.action_value:

                ret = "%s %s:<strong>%s</strong><br/>" %(ret, statement.action, statement.action_value)

            else: 

                ret = "%s %s<br>" %(ret, statement.action)

        return ret.rstrip(',')

    get_then.short_description = 'Then statement'

    get_then.allow_tags = True

#

    def get_match(self):

        ret = ''

        if self.destination:

            ret = ret = '%s Destination Address:<strong>%s</strong><br/>' %(ret, self.destination)

        if self.fragmenttype:

            ret = ret = "%s Fragment Type:<strong>%s</strong><br/>" %(ret, self.fragmenttype)

        if self.icmpcode:

            ret = ret = "%s ICMP code:<strong>%s</strong><br/>" %(ret, self.icmpcode)

        if self.icmptype:

            ret = ret = "%s ICMP Type:<strong>%s</strong><br/>" %(ret, self.icmptype)

        if self.packetlength:

            ret = ret = "%s Packet Length:<strong>%s</strong><br/>" %(ret, self.packetlength)

        if self.protocol:

            ret = ret = "%s Protocol:<strong>%s</strong><br/>" %(ret, self.protocol)

        if self.source:

            ret = ret = "%s Source Address:<strong>%s</strong><br/>" %(ret, self.source)

        if self.tcpflag:

            ret = ret = "%s TCP flag:<strong>%s</strong><br/>" %(ret, self.tcpflag)

        if self.port:

            for port in self.port.all():

                    ret = "%s Port:<strong>%s</strong><br/>" %(ret, port)

        if self.destinationport:

            for port in self.destinationport.all():

                    ret = "%s Port:<strong>%s</strong><br/>" %(ret, port)

        if self.sourceport:

            for port in self.sourceport.all():

                    ret = "%s Port:<strong>%s</strong><br/>" %(ret, port)

        if self.dscp:

            for dscp in self.dscp.all():

                    ret = "%s Port:<strong>%s</strong><br/>" %(ret, dscp)

        return ret.rstrip('<br/>')

    get_match.short_description = 'Match statement'

    get_match.allow_tags = True