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Editing: fw_zone.py

# -*- coding: utf-8 -*-
#
# Copyright (C) 2011-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

import copy
from firewall.core.base import SHORTCUTS, DEFAULT_ZONE_TARGET, SOURCE_IPSET_TYPES
from firewall.core.fw_transaction import FirewallTransaction
from firewall.core.io.policy import Policy
from firewall.core.logger import log
from firewall.core.rich import (
    Rich_ForwardPort,
    Rich_IcmpBlock,
    Rich_IcmpType,
    Rich_Mark,
    Rich_Masquerade,
    Rich_Port,
    Rich_Protocol,
    Rich_Rule,
    Rich_Service,
    Rich_SourcePort,
    Rich_Tcp_Mss_Clamp
)
from firewall.core.fw_nm import nm_get_bus_name
from firewall.functions import checkIPnMask, checkIP6nMask, check_mac
from firewall import errors
from firewall.errors import FirewallError

class FirewallZone(object):
    ZONE_POLICY_PRIORITY = 0

def __init__(self, fw):
        self._fw = fw
        self._zones = { }
        self._zone_policies = { }

def __repr__(self):
        return '%s(%r)' % (self.__class__, self._zones)

def cleanup(self):
        self._zones.clear()
        self._zone_policies.clear()

def new_transaction(self):
        t = FirewallTransaction(self._fw)
        t.add_pre(self._fw.full_check_config)
        return t

def policy_name_from_zones(self, fromZone, toZone):
        return "zone_{fromZone}_{toZone}".format(fromZone=fromZone, toZone=toZone)

# zones

def get_zones(self):
        return sorted(self._zones.keys())

def get_active_zones(self):
        active_zones = []
        for zone in self.get_zones():
            if self.list_interfaces(zone) or self.list_sources(zone):
                active_zones.append(zone)
        return active_zones

def get_zone_of_interface(self, interface):
        interface_id = self.__interface_id(interface)
        for zone in self._zones:
            if interface_id in self._zones[zone].interfaces:
                # an interface can only be part of one zone
                return zone
        return None

def get_zone_of_source(self, source):
        source_id = self.__source_id(source)
        for zone in self._zones:
            if source_id in self._zones[zone].sources:
                # a source_id can only be part of one zone
                return zone
        return None

def get_zone(self, zone):
        z = self._fw.check_zone(zone)
        return self._zones[z]

def policy_obj_from_zone_obj(self, z_obj, fromZone, toZone):
        p_obj = Policy()
        p_obj.derived_from_zone = z_obj.name
        p_obj.name = self.policy_name_from_zones(fromZone, toZone)
        p_obj.priority = self.ZONE_POLICY_PRIORITY
        p_obj.target = z_obj.target
        p_obj.ingress_zones = [fromZone]
        p_obj.egress_zones = [toZone]

# copy zone permanent config to policy permanent config
        # WARN: This assumes the same attribute names.
        #
        for setting in ["services", "ports",
                        "masquerade", "forward_ports",
                        "source_ports",
                        "icmp_blocks", "icmp_block_inversion",
                        "rules_str", "protocols"]:
            if fromZone == z_obj.name and toZone == "HOST" and \
               setting in ["services", "ports", "source_ports", "icmp_blocks",
                           "icmp_block_inversion", "protocols"]:
                # zone --> HOST
                setattr(p_obj, setting, copy.deepcopy(getattr(z_obj, setting)))
            elif fromZone == "ANY" and toZone == z_obj.name and setting in ["masquerade"]:
                # any zone --> zone
                setattr(p_obj, setting, copy.deepcopy(getattr(z_obj, setting)))
            elif fromZone == z_obj.name and toZone == "ANY" and \
                 setting in ["forward_ports"]:
                # zone --> any zone
                setattr(p_obj, setting, copy.deepcopy(getattr(z_obj, setting)))
            elif setting in ["rules_str"]:
                p_obj.rules_str = []
                p_obj.rules = []
                for rule_str in z_obj.rules_str:
                    current_policy = self.policy_name_from_zones(fromZone, toZone)

rule = Rich_Rule(rule_str=rule_str)
                    if current_policy in self._rich_rule_to_policies(z_obj.name, rule):
                        p_obj.rules_str.append(rule_str)
                        p_obj.rules.append(rule)

return p_obj

def add_zone(self, obj):
        self._zones[obj.name] = obj
        self._zone_policies[obj.name] = []

# Create policy objects, will need many:
        #   - (zone --> HOST) - ports, service, etc
        #   - (any zone --> zone) - masquerade
        #   - (zone --> any zone)
        #       - also includes forward-ports because it works on (nat,
        #       PREROUTING) and therefore applies to redirects to the local
        #       host or dnat to a different host.
        #       - also includes rich rule "mark" action for the same reason
        #
        for fromZone,toZone in [(obj.name, "HOST"),
                                ("ANY", obj.name), (obj.name, "ANY")]:
            p_obj = self.policy_obj_from_zone_obj(obj, fromZone, toZone)
            self._fw.policy.add_policy(p_obj)
            self._zone_policies[obj.name].append(p_obj.name)

def remove_zone(self, zone):
        obj = self._zones[zone]
        if obj.applied:
            self.unapply_zone_settings(zone)
        del self._zones[zone]
        del self._zone_policies[zone]

def apply_zones(self, use_transaction=None):
        for zone in self.get_zones():
            z_obj = self._zones[zone]
            if len(z_obj.interfaces) > 0 or len(z_obj.sources) > 0:
                log.debug1("Applying zone '%s'", zone)
                self.apply_zone_settings(zone, use_transaction=use_transaction)

def set_zone_applied(self, zone, applied):
        obj = self._zones[zone]
        obj.applied = applied

# zone from chain

def zone_from_chain(self, chain):
        if "_" not in chain:
            # no zone chain
            return None
        splits = chain.split("_")
        if len(splits) < 2:
            return None
        _chain = None
        for x in SHORTCUTS:
            if splits[0] == SHORTCUTS[x]:
                _chain = x
        if _chain is not None:
            # next part needs to be zone name
            if splits[1] not in self.get_zones():
                return None
            if len(splits) == 2 or \
               (len(splits) == 3 and splits[2] in [ "pre", "log", "deny", "allow", "post" ]):
                return (splits[1], _chain)
        return None

def policy_from_chain(self, chain):
        x = self.zone_from_chain(chain)
        if x is None:
            return None

(zone, _chain) = x
        # derived from _get_table_chains_for_zone_dispatch()
        if _chain in ["PREROUTING", "FORWARD"]:
            fromZone = zone
            toZone = "ANY"
        elif _chain in ["INPUT"]:
            fromZone = zone
            toZone = "HOST"
        elif _chain in ["POSTROUTING"]:
            fromZone = "ANY"
            toZone = zone
        else:
            raise FirewallError(errors.INVALID_CHAIN, "chain '%s' can't be mapped to a policy" % (chain))

return (self.policy_name_from_zones(fromZone, toZone), _chain)

def create_zone_base_by_chain(self, ipv, table, chain,
                                  use_transaction=None):

# Create zone base chains if the chain is reserved for a zone
        if ipv in [ "ipv4", "ipv6" ]:
            x = self.policy_from_chain(chain)
            if x is not None:
                (policy, _chain) = self.policy_from_chain(chain)
                if use_transaction is None:
                    transaction = self.new_transaction()
                else:
                    transaction = use_transaction

self._fw.policy.gen_chain_rules(policy, True, table, _chain,
                                                transaction)

if use_transaction is None:
                    transaction.execute(True)

def _zone_settings(self, enable, zone, transaction):
        for key in ["interfaces", "sources", "forward", "icmp_block_inversion"]:
            args_list = getattr(self.get_zone(zone), key)
            if isinstance(args_list, bool):
                args_list = [args_list]
            for args in args_list:
                if key == "interfaces":
                    self._interface(enable, zone, args, transaction)
                elif key == "sources":
                    ipv = self.check_source(args)
                    self._source(enable, zone, ipv, args, transaction)
                elif key == "icmp_block_inversion":
                    continue
                elif key == "forward":
                    # no need to call this when applying the zone as the rules
                    # will be generated when adding the interfaces/sources
                    pass
                else:
                    log.warning("Zone '%s': Unknown setting '%s:%s', "
                                "unable to apply", zone, key, args)
        # ICMP-block-inversion is always applied
        if enable:
            self._icmp_block_inversion(enable, zone, transaction)

def apply_zone_settings(self, zone, use_transaction=None):
        _zone = self._fw.check_zone(zone)
        obj = self._zones[_zone]
        if obj.applied:
            return
        obj.applied = True

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

for policy in self._zone_policies[_zone]:
            log.debug1("Applying policy (%s) derived from zone '%s'", policy, zone)
            self._fw.policy.apply_policy_settings(policy, use_transaction=transaction)

self._zone_settings(True, _zone, transaction)

if use_transaction is None:
            transaction.execute(True)

def unapply_zone_settings(self, zone, use_transaction=None):
        _zone = self._fw.check_zone(zone)
        obj = self._zones[_zone]
        if not obj.applied:
            return

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

for policy in self._zone_policies[_zone]:
            self._fw.policy.unapply_policy_settings(policy, use_transaction=transaction)

self._zone_settings(False, _zone, transaction)

if use_transaction is None:
            transaction.execute(True)

def get_config_with_settings(self, zone):
        """
        :return: exported config updated with runtime settings
        """
        obj = self.get_zone(zone)
        conf_dict = self.get_config_with_settings_dict(zone)
        conf_list = []
        for i in range(16): # tuple based API has 16 elements
            if obj.IMPORT_EXPORT_STRUCTURE[i][0] not in conf_dict:
                # old API needs the empty elements as well. Grab it from the
                # class otherwise we don't know the type.
                conf_list.append(copy.deepcopy(getattr(obj, obj.IMPORT_EXPORT_STRUCTURE[i][0])))
            else:
                conf_list.append(conf_dict[obj.IMPORT_EXPORT_STRUCTURE[i][0]])
        return tuple(conf_list)

def get_config_with_settings_dict(self, zone):
        """
        :return: exported config updated with runtime settings
        """
        permanent = self.get_zone(zone).export_config_dict()
        if permanent["target"] == DEFAULT_ZONE_TARGET:
            permanent["target"] = "default"
        runtime = { "services": self.list_services(zone),
                    "ports": self.list_ports(zone),
                    "icmp_blocks": self.list_icmp_blocks(zone),
                    "masquerade": self.query_masquerade(zone),
                    "forward_ports": self.list_forward_ports(zone),
                    "interfaces": self.list_interfaces(zone),
                    "sources": self.list_sources(zone),
                    "rules_str": self.list_rules(zone),
                    "protocols": self.list_protocols(zone),
                    "source_ports": self.list_source_ports(zone),
                    "icmp_block_inversion": self.query_icmp_block_inversion(zone),
                    "forward": self.query_forward(zone),
                    }
        return self._fw.combine_runtime_with_permanent_settings(permanent, runtime)

def set_config_with_settings_dict(self, zone, settings, sender):
        # stupid wrappers to convert rich rule string to rich rule object
        def add_rule_wrapper(zone, rule_str, timeout=0, sender=None):
            self.add_rule(zone, Rich_Rule(rule_str=rule_str), timeout=0, sender=sender)
        def remove_rule_wrapper(zone, rule_str):
            self.remove_rule(zone, Rich_Rule(rule_str=rule_str))

setting_to_fn = {
            "services": (self.add_service, self.remove_service),
            "ports": (self.add_port, self.remove_port),
            "icmp_blocks": (self.add_icmp_block, self.remove_icmp_block),
            "masquerade": (self.add_masquerade, self.remove_masquerade),
            "forward_ports": (self.add_forward_port, self.remove_forward_port),
            "interfaces": (self.add_interface, self.remove_interface),
            "sources": (self.add_source, self.remove_source),
            "rules_str": (add_rule_wrapper, remove_rule_wrapper),
            "protocols": (self.add_protocol, self.remove_protocol),
            "source_ports": (self.add_source_port, self.remove_source_port),
            "icmp_block_inversion": (self.add_icmp_block_inversion, self.remove_icmp_block_inversion),
            "forward": (self.add_forward, self.remove_forward),
        }

# do a full config check on a temporary object before trying to make
        # the runtime changes
        old_obj = self.get_zone(zone)
        check_obj = copy.copy(old_obj)
        check_obj.import_config_dict(settings, self._fw.get_all_io_objects_dict())
        self._fw.full_check_config({"zones": [check_obj]})

old_settings = self.get_config_with_settings_dict(zone)
        (add_settings, remove_settings) = self._fw.get_added_and_removed_settings(old_settings, settings)

for key in remove_settings:
            if isinstance(remove_settings[key], list):
                for args in remove_settings[key]:
                    if isinstance(args, tuple):
                        setting_to_fn[key][1](zone, *args)
                    else:
                        setting_to_fn[key][1](zone, args)
            else: # bool
                setting_to_fn[key][1](zone)

for key in add_settings:
            if isinstance(add_settings[key], list):
                for args in add_settings[key]:
                    if key in ["interfaces", "sources"]:
                        # no timeout arg
                        setting_to_fn[key][0](zone, args, sender=sender)
                    else:
                        if isinstance(args, tuple):
                            setting_to_fn[key][0](zone, *args, timeout=0, sender=sender)
                        else:
                            setting_to_fn[key][0](zone, args, timeout=0, sender=sender)
            else: # bool
                if key in ["icmp_block_inversion"]:
                    # no timeout arg
                    setting_to_fn[key][0](zone, sender=sender)
                else:
                    setting_to_fn[key][0](zone, timeout=0, sender=sender)

# INTERFACES

def check_interface(self, interface):
        self._fw.check_interface(interface)

def __interface_id(self, interface):
        self.check_interface(interface)
        return interface

def add_interface(self, zone, interface, sender=None,
                      use_transaction=None, allow_apply=True):
        self._fw.check_panic()
        _zone = self._fw.check_zone(zone)
        _obj = self._zones[_zone]

interface_id = self.__interface_id(interface)

if interface_id in _obj.interfaces:
            raise FirewallError(errors.ZONE_ALREADY_SET,
                                "'%s' already bound to '%s'" % (interface,
                                                                zone))
        zoi = self.get_zone_of_interface(interface)
        if zoi is not None:
            raise FirewallError(errors.ZONE_CONFLICT,
                                "'%s' already bound to '%s'" % (interface,
                                                                 zoi))

log.debug1("Setting zone of interface '%s' to '%s'" % (interface,
                                                               _zone))

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

if not _obj.applied and allow_apply:
            self.apply_zone_settings(zone,
                                     use_transaction=transaction)
            transaction.add_fail(self.set_zone_applied, _zone, False)

if allow_apply:
            self._interface(True, _zone, interface, transaction)

self.__register_interface(_obj, interface_id, zone, sender)
        transaction.add_fail(self.__unregister_interface, _obj,
                                  interface_id)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __register_interface(self, _obj, interface_id, zone, sender):
        _obj.interfaces.append(interface_id)
        if not zone or zone == "":
            self._fw._default_zone_interfaces.append(interface_id)
        if sender == nm_get_bus_name():
            self._fw._nm_assigned_interfaces.append(interface_id)

def change_zone_of_interface(self, zone, interface, sender=None):
        self._fw.check_panic()
        _old_zone = self.get_zone_of_interface(interface)
        _new_zone = self._fw.check_zone(zone)

if _new_zone == _old_zone:
            return _old_zone

if _old_zone is not None:
            self.remove_interface(_old_zone, interface)

_zone = self.add_interface(zone, interface, sender)

return _zone

def change_default_zone(self, old_zone, new_zone, use_transaction=None):
        self._fw.check_panic()

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

self.apply_zone_settings(new_zone, transaction)
        self._interface(True, new_zone, "+", transaction, append=True)
        if old_zone is not None and old_zone != "":
            self._interface(False, old_zone, "+", transaction, append=True)

if use_transaction is None:
            transaction.execute(True)

def remove_interface(self, zone, interface,
                         use_transaction=None):
        self._fw.check_panic()
        zoi = self.get_zone_of_interface(interface)
        if zoi is None:
            raise FirewallError(errors.UNKNOWN_INTERFACE,
                                "'%s' is not in any zone" % interface)
        _zone = zoi if zone == "" else self._fw.check_zone(zone)
        if zoi != _zone:
            raise FirewallError(errors.ZONE_CONFLICT,
                                "remove_interface(%s, %s): zoi='%s'" % \
                                (zone, interface, zoi))

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

_obj = self._zones[_zone]
        interface_id = self.__interface_id(interface)
        transaction.add_post(self.__unregister_interface, _obj, interface_id)
        self._interface(False, _zone, interface, transaction)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __unregister_interface(self, _obj, interface_id):
        if interface_id in _obj.interfaces:
            _obj.interfaces.remove(interface_id)
        if interface_id in self._fw._default_zone_interfaces:
            self._fw._default_zone_interfaces.remove(interface_id)
        if interface_id in self._fw._nm_assigned_interfaces:
            self._fw._nm_assigned_interfaces.remove(interface_id)

def query_interface(self, zone, interface):
        return self.__interface_id(interface) in self.get_zone(zone).interfaces

def list_interfaces(self, zone):
        return self.get_zone(zone).interfaces

# SOURCES

def check_source(self, source, applied=False):
        if checkIPnMask(source):
            return "ipv4"
        elif checkIP6nMask(source):
            return "ipv6"
        elif check_mac(source):
            return ""
        elif source.startswith("ipset:"):
            self._check_ipset_type_for_source(source[6:])
            if applied:
                self._check_ipset_applied(source[6:])
            return self._ipset_family(source[6:])
        else:
            raise FirewallError(errors.INVALID_ADDR, source)

def __source_id(self, source, applied=False):
        self.check_source(source, applied=applied)
        return source

def add_source(self, zone, source, sender=None, use_transaction=None,
                   allow_apply=True):
        self._fw.check_panic()
        _zone = self._fw.check_zone(zone)
        _obj = self._zones[_zone]

if check_mac(source):
            source = source.upper()

ipv = self.check_source(source, applied=allow_apply)
        source_id = self.__source_id(source, applied=allow_apply)

if source_id in _obj.sources:
            raise FirewallError(errors.ZONE_ALREADY_SET,
                            "'%s' already bound to '%s'" % (source, _zone))
        if self.get_zone_of_source(source) is not None:
            raise FirewallError(errors.ZONE_CONFLICT,
                                "'%s' already bound to a zone" % source)

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

if allow_apply:
            self._source(True, _zone, ipv, source_id, transaction)

self.__register_source(_obj, source_id, zone, sender)
        transaction.add_fail(self.__unregister_source, _obj, source_id)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __register_source(self, _obj, source_id, zone, sender):
        _obj.sources.append(source_id)

def change_zone_of_source(self, zone, source, sender=None):
        self._fw.check_panic()
        _old_zone = self.get_zone_of_source(source)
        _new_zone = self._fw.check_zone(zone)

if _new_zone == _old_zone:
            return _old_zone

if check_mac(source):
            source = source.upper()

if _old_zone is not None:
            self.remove_source(_old_zone, source)

_zone = self.add_source(zone, source, sender)

return _zone

def remove_source(self, zone, source,
                      use_transaction=None):
        self._fw.check_panic()
        if check_mac(source):
            source = source.upper()
        zos = self.get_zone_of_source(source)
        if zos is None:
            raise FirewallError(errors.UNKNOWN_SOURCE,
                                "'%s' is not in any zone" % source)
        _zone = zos if zone == "" else self._fw.check_zone(zone)
        if zos != _zone:
            raise FirewallError(errors.ZONE_CONFLICT,
                                "remove_source(%s, %s): zos='%s'" % \
                                (zone, source, zos))

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

_obj = self._zones[_zone]
        ipv = self.check_source(source)
        source_id = self.__source_id(source)
        transaction.add_post(self.__unregister_source, _obj, source_id)
        self._source(False, _zone, ipv, source_id, transaction)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __unregister_source(self, _obj, source_id):
        if source_id in _obj.sources:
            _obj.sources.remove(source_id)

def query_source(self, zone, source):
        if check_mac(source):
            source = source.upper()
        return self.__source_id(source) in self.get_zone(zone).sources

def list_sources(self, zone):
        return self.get_zone(zone).sources

def _interface(self, enable, zone, interface, transaction, append=False):
        for backend in self._fw.enabled_backends():
            if not backend.policies_supported:
                continue
            for policy in self._zone_policies[zone]:
                for (table, chain) in self._fw.policy._get_table_chains_for_zone_dispatch(policy):
                    rules = backend.build_zone_source_interface_rules(enable,
                                    zone, policy, interface, table, chain, append)
                    transaction.add_rules(backend, rules)

# intra zone forward
            policy = self.policy_name_from_zones(zone, "ANY")
            # Skip adding wildcard/catch-all interface (for default
            # zone). Otherwise it would allow forwarding from interface
            # in default zone -> interface not in default zone (but in
            # a different zone).
            if self.get_zone(zone).forward and interface not in ["+", "*"]:
                rules = backend.build_zone_forward_rules(enable, zone, policy, "filter", interface=interface)
                transaction.add_rules(backend, rules)

# update policy dispatch for any policy using this zone in ingress
        # or egress
        for policy in self._fw.policy.get_policies_not_derived_from_zone():
            if zone not in self._fw.policy.list_ingress_zones(policy) and \
               zone not in self._fw.policy.list_egress_zones(policy):
                continue
            if policy in self._fw.policy.get_active_policies_not_derived_from_zone() and self._fw.policy.get_policy(policy).applied:
                # first remove the old set of interfaces using the current zone
                # settings.
                if not enable and len(self.list_interfaces(zone)) == 1:
                    self._fw.policy.unapply_policy_settings(policy, use_transaction=transaction)
                else:
                    self._fw.policy._ingress_egress_zones(False, policy, transaction)
                    # after the transaction ends and therefore the interface
                    # has been added to the zone's settings, update the
                    # dependent policies
                    transaction.add_post(lambda p: (p in self._fw.policy.get_active_policies_not_derived_from_zone()) and \
                                                   self._fw.policy._ingress_egress_zones_transaction(True, p), policy)
            elif enable:
                transaction.add_post(lambda p: (p in self._fw.policy.get_active_policies_not_derived_from_zone()) and \
                                               self._fw.policy.apply_policy_settings(p), policy)

# IPSETS

def _ipset_family(self, name):
        if self._ipset_type(name) == "hash:mac":
            return None
        return self._fw.ipset.get_family(name, applied=False)

def _ipset_type(self, name):
        return self._fw.ipset.get_type(name, applied=False)

def _ipset_match_flags(self, name, flag):
        return ",".join([flag] * self._fw.ipset.get_dimension(name))

def _check_ipset_applied(self, name):
        return self._fw.ipset.check_applied(name)

def _check_ipset_type_for_source(self, name):
        _type = self._ipset_type(name)
        if _type not in SOURCE_IPSET_TYPES:
            raise FirewallError(
                errors.INVALID_IPSET,
                "ipset '%s' with type '%s' not usable as source" % \
                (name, _type))

def _source(self, enable, zone, ipv, source, transaction):
        # For mac source bindings ipv is an empty string, the mac source will
        # be added for ipv4 and ipv6
        for backend in [self._fw.get_backend_by_ipv(ipv)] if ipv else self._fw.enabled_backends():
            if not backend.policies_supported:
                continue
            for policy in self._zone_policies[zone]:
                for (table, chain) in self._fw.policy._get_table_chains_for_zone_dispatch(policy):
                    rules = backend.build_zone_source_address_rules(enable, zone,
                                            policy, source, table, chain)
                    transaction.add_rules(backend, rules)

# intra zone forward
            policy = self.policy_name_from_zones(zone, "ANY")
            if self.get_zone(zone).forward:
                rules = backend.build_zone_forward_rules(enable, zone, policy, "filter", source=source)
                transaction.add_rules(backend, rules)

# update policy dispatch for any policy using this zone in ingress
        # or egress
        for policy in self._fw.policy.get_policies_not_derived_from_zone():
            if zone not in self._fw.policy.list_ingress_zones(policy) and \
               zone not in self._fw.policy.list_egress_zones(policy):
                continue
            if policy in self._fw.policy.get_active_policies_not_derived_from_zone() and self._fw.policy.get_policy(policy).applied:
                # first remove the old set of sources using the current zone
                # settings.
                if not enable and len(self.list_sources(zone)) == 1:
                    self._fw.policy.unapply_policy_settings(policy, use_transaction=transaction)
                else:
                    self._fw.policy._ingress_egress_zones(False, policy, transaction)
                    # after the transaction ends and therefore the sources
                    # has been added to the zone's settings, update the
                    # dependent policies
                    transaction.add_post(lambda p: (p in self._fw.policy.get_active_policies_not_derived_from_zone()) and \
                                                   self._fw.policy._ingress_egress_zones_transaction(True, p), policy)
            elif enable:
                transaction.add_post(lambda p: (p in self._fw.policy.get_active_policies_not_derived_from_zone()) and \
                                               self._fw.policy.apply_policy_settings(p), policy)

def add_service(self, zone, service, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_service(p_name, service, timeout, sender)
        return zone

def remove_service(self, zone, service):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_service(p_name, service)
        return zone

def query_service(self, zone, service):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_service(p_name, service)

def list_services(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.list_services(p_name)

def add_port(self, zone, port, protocol, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_port(p_name, port, protocol, timeout, sender)
        return zone

def remove_port(self, zone, port, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_port(p_name, port, protocol)
        return zone

def query_port(self, zone, port, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_port(p_name, port, protocol)

def list_ports(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.list_ports(p_name)

def add_source_port(self, zone, source_port, protocol, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_source_port(p_name, source_port, protocol, timeout, sender)
        return zone

def remove_source_port(self, zone, source_port, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_source_port(p_name, source_port, protocol)
        return zone

def query_source_port(self, zone, source_port, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_source_port(p_name, source_port, protocol)

def list_source_ports(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.list_source_ports(p_name)

def _rich_rule_to_policies(self, zone, rule):
        zone = self._fw.check_zone(zone)
        if type(rule.action) == Rich_Mark:
            return [self.policy_name_from_zones(zone, "ANY")]
        elif type(rule.element) in [Rich_Service, Rich_Port, Rich_Protocol,
                                    Rich_SourcePort, Rich_IcmpBlock, Rich_IcmpType]:
            return [self.policy_name_from_zones(zone, "HOST")]
        elif type(rule.element) in [Rich_ForwardPort]:
            return [self.policy_name_from_zones(zone, "ANY")]
        elif type(rule.element) in [Rich_Masquerade]:
            return [self.policy_name_from_zones("ANY", zone)]
        elif type(rule.element) in [Rich_Tcp_Mss_Clamp]:
            return [self.policy_name_from_zones(zone, "ANY")]
        elif rule.element is None:
            return [self.policy_name_from_zones(zone, "HOST")]
        else:
            raise FirewallError(errors.INVALID_RULE, "Rich rule type (%s) not handled." % (type(rule.element)))

def add_rule(self, zone, rule, timeout=0, sender=None):
        for p_name in self._rich_rule_to_policies(zone, rule):
            self._fw.policy.add_rule(p_name, rule, timeout, sender)
        return zone

def remove_rule(self, zone, rule):
        for p_name in self._rich_rule_to_policies(zone, rule):
            self._fw.policy.remove_rule(p_name, rule)
        return zone

def query_rule(self, zone, rule):
        ret = True
        for p_name in self._rich_rule_to_policies(zone, rule):
            ret = ret and self._fw.policy.query_rule(p_name, rule)
        return ret

def list_rules(self, zone):
        zone = self._fw.check_zone(zone)
        ret = set()
        for p_name in [self.policy_name_from_zones(zone, "ANY"),
                       self.policy_name_from_zones(zone, "HOST"),
                       self.policy_name_from_zones("ANY", zone)]:
            ret.update(set(self._fw.policy.list_rules(p_name)))
        return list(ret)

def add_protocol(self, zone, protocol, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_protocol(p_name, protocol, timeout, sender)
        return zone

def remove_protocol(self, zone, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_protocol(p_name, protocol)
        return zone

def query_protocol(self, zone, protocol):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_protocol(p_name, protocol)

def list_protocols(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.list_protocols(p_name)

def add_masquerade(self, zone, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones("ANY", zone)
        self._fw.policy.add_masquerade(p_name, timeout, sender)
        return zone

def remove_masquerade(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones("ANY", zone)
        self._fw.policy.remove_masquerade(p_name)
        return zone

def query_masquerade(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones("ANY", zone)
        return self._fw.policy.query_masquerade(p_name)

def add_forward_port(self, zone, port, protocol, toport=None,
                         toaddr=None, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "ANY")
        self._fw.policy.add_forward_port(p_name, port, protocol, toport, toaddr,
                                         timeout, sender)
        return zone

def remove_forward_port(self, zone, port, protocol, toport=None,
                            toaddr=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "ANY")
        self._fw.policy.remove_forward_port(p_name, port, protocol, toport, toaddr)
        return zone

def query_forward_port(self, zone, port, protocol, toport=None,
                           toaddr=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "ANY")
        return self._fw.policy.query_forward_port(p_name, port, protocol, toport,
                                                  toaddr)

def list_forward_ports(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "ANY")
        return self._fw.policy.list_forward_ports(p_name)

def add_icmp_block(self, zone, icmp, timeout=0, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_icmp_block(p_name, icmp, timeout, sender)

return zone

def remove_icmp_block(self, zone, icmp):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_icmp_block(p_name, icmp)

return zone

def query_icmp_block(self, zone, icmp):
        zone = self._fw.check_zone(zone)
        p_name_host = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_icmp_block(p_name_host, icmp)

def list_icmp_blocks(self, zone):
        zone = self._fw.check_zone(zone)
        p_name_host = self.policy_name_from_zones(zone, "HOST")
        return sorted(set(self._fw.policy.list_icmp_blocks(p_name_host)))

def add_icmp_block_inversion(self, zone, sender=None):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.add_icmp_block_inversion(p_name, sender)

return zone

def _icmp_block_inversion(self, enable, zone, transaction):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy._icmp_block_inversion(enable, p_name, transaction)

def remove_icmp_block_inversion(self, zone):
        zone = self._fw.check_zone(zone)
        p_name = self.policy_name_from_zones(zone, "HOST")
        self._fw.policy.remove_icmp_block_inversion(p_name)

return zone

def query_icmp_block_inversion(self, zone):
        zone = self._fw.check_zone(zone)
        p_name_host = self.policy_name_from_zones(zone, "HOST")
        return self._fw.policy.query_icmp_block_inversion(p_name_host)

def _forward(self, enable, zone, transaction):
        p_name = self.policy_name_from_zones(zone, "ANY")

for interface in self._zones[zone].interfaces:
            for backend in self._fw.enabled_backends():
                if not backend.policies_supported:
                    continue
                rules = backend.build_zone_forward_rules(enable, zone, p_name, "filter", interface=interface)
                transaction.add_rules(backend, rules)

for source in self._zones[zone].sources:
            ipv = self.check_source(source)
            for backend in [self._fw.get_backend_by_ipv(ipv)] if ipv else self._fw.enabled_backends():
                if not backend.policies_supported:
                    continue
                rules = backend.build_zone_forward_rules(enable, zone, p_name, "filter", source=source)
                transaction.add_rules(backend, rules)

def add_forward(self, zone, timeout=0, sender=None,
                    use_transaction=None):
        _zone = self._fw.check_zone(zone)
        self._fw.check_timeout(timeout)
        self._fw.check_panic()
        _obj = self._zones[_zone]

if _obj.forward:
            raise FirewallError(errors.ALREADY_ENABLED,
                                "forward already enabled in '%s'" % _zone)

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

if _obj.applied:
            self._forward(True, _zone, transaction)

self.__register_forward(_obj, timeout, sender)
        transaction.add_fail(self.__unregister_forward, _obj)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __register_forward(self, _obj, timeout, sender):
        _obj.forward = True

def remove_forward(self, zone, use_transaction=None):
        _zone = self._fw.check_zone(zone)
        self._fw.check_panic()
        _obj = self._zones[_zone]

if not _obj.forward:
            raise FirewallError(errors.NOT_ENABLED,
                                "forward not enabled in '%s'" % _zone)

if use_transaction is None:
            transaction = self.new_transaction()
        else:
            transaction = use_transaction

if _obj.applied:
            self._forward(False, _zone, transaction)

transaction.add_post(self.__unregister_forward, _obj)

if use_transaction is None:
            transaction.execute(True)

return _zone

def __unregister_forward(self, _obj):
        _obj.forward = False

def query_forward(self, zone):
        return self.get_zone(zone).forward

[ BATAL ]