Current File : //usr/lib/python3.6/site-packages/firewall/core/io/policy.py
# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: GPL-2.0-or-later
__all__ = [ "Policy", "policy_reader", "policy_writer" ]
import xml.sax as sax
import os
import io
import shutil
from firewall import config
from firewall.functions import checkIP, checkIP6
from firewall.functions import uniqify, max_policy_name_len, portStr
from firewall.core.base import DEFAULT_POLICY_TARGET, POLICY_TARGETS, DEFAULT_POLICY_PRIORITY
from firewall.core.io.io_object import IO_Object, \
IO_Object_ContentHandler, IO_Object_XMLGenerator, check_port, \
check_tcpudp, check_protocol
from firewall.core import rich
from firewall.core.logger import log
from firewall import errors
from firewall.errors import FirewallError
def common_startElement(obj, name, attrs):
if name == "short":
pass
elif name == "description":
pass
elif name == "service":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_Service(attrs["name"])
return True
if attrs["name"] not in obj.item.services:
obj.item.services.append(attrs["name"])
else:
log.warning("Service '%s' already set, ignoring.",
attrs["name"])
elif name == "port":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_Port(attrs["port"],
attrs["protocol"])
return True
check_port(attrs["port"])
check_tcpudp(attrs["protocol"])
entry = (portStr(attrs["port"], "-"), attrs["protocol"])
if entry not in obj.item.ports:
obj.item.ports.append(entry)
else:
log.warning("Port '%s/%s' already set, ignoring.",
attrs["port"], attrs["protocol"])
elif name == "protocol":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_Protocol(attrs["value"])
else:
check_protocol(attrs["value"])
if attrs["value"] not in obj.item.protocols:
obj.item.protocols.append(attrs["value"])
else:
log.warning("Protocol '%s' already set, ignoring.",
attrs["value"])
elif name == "icmp-block":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_IcmpBlock(attrs["name"])
return True
if attrs["name"] not in obj.item.icmp_blocks:
obj.item.icmp_blocks.append(attrs["name"])
else:
log.warning("icmp-block '%s' already set, ignoring.",
attrs["name"])
elif name == "icmp-type":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_IcmpType(attrs["name"])
return True
else:
log.warning("Invalid rule: icmp-block '%s' outside of rule",
attrs["name"])
elif name == "masquerade":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_Masquerade()
else:
if obj.item.masquerade:
log.warning("Masquerade already set, ignoring.")
else:
obj.item.masquerade = True
elif name == "forward-port":
to_port = ""
if "to-port" in attrs:
to_port = attrs["to-port"]
to_addr = ""
if "to-addr" in attrs:
to_addr = attrs["to-addr"]
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_ForwardPort(attrs["port"],
attrs["protocol"],
to_port, to_addr)
return True
check_port(attrs["port"])
check_tcpudp(attrs["protocol"])
if to_port:
check_port(to_port)
if to_addr:
if not checkIP(to_addr) and not checkIP6(to_addr):
raise FirewallError(errors.INVALID_ADDR,
"to-addr '%s' is not a valid address" \
% to_addr)
entry = (portStr(attrs["port"], "-"), attrs["protocol"],
portStr(to_port, "-"), str(to_addr))
if entry not in obj.item.forward_ports:
obj.item.forward_ports.append(entry)
else:
log.warning("Forward port %s/%s%s%s already set, ignoring.",
attrs["port"], attrs["protocol"],
" >%s" % to_port if to_port else "",
" @%s" % to_addr if to_addr else "")
elif name == "source-port":
if obj._rule:
if obj._rule.element:
log.warning("Invalid rule: More than one element in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.element = rich.Rich_SourcePort(attrs["port"],
attrs["protocol"])
return True
check_port(attrs["port"])
check_tcpudp(attrs["protocol"])
entry = (portStr(attrs["port"], "-"), attrs["protocol"])
if entry not in obj.item.source_ports:
obj.item.source_ports.append(entry)
else:
log.warning("Source port '%s/%s' already set, ignoring.",
attrs["port"], attrs["protocol"])
elif name == "destination":
if not obj._rule:
log.warning('Invalid rule: Destination outside of rule')
obj._rule_error = True
return True
if obj._rule.destination:
log.warning("Invalid rule: More than one destination in rule '%s', ignoring.",
str(obj._rule))
return True
invert = False
address = None
if "address" in attrs:
address = attrs["address"]
ipset = None
if "ipset" in attrs:
ipset = attrs["ipset"]
if "invert" in attrs and \
attrs["invert"].lower() in [ "yes", "true" ]:
invert = True
obj._rule.destination = rich.Rich_Destination(address,
ipset,
invert)
elif name in [ "accept", "reject", "drop", "mark" ]:
if not obj._rule:
log.warning('Invalid rule: Action outside of rule')
obj._rule_error = True
return True
if obj._rule.action:
log.warning('Invalid rule: More than one action')
obj._rule_error = True
return True
if name == "accept":
obj._rule.action = rich.Rich_Accept()
elif name == "reject":
_type = None
if "type" in attrs:
_type = attrs["type"]
obj._rule.action = rich.Rich_Reject(_type)
elif name == "drop":
obj._rule.action = rich.Rich_Drop()
elif name == "mark":
_set = attrs["set"]
obj._rule.action = rich.Rich_Mark(_set)
obj._limit_ok = obj._rule.action
elif name == "log":
if not obj._rule:
log.warning('Invalid rule: Log outside of rule')
return True
if obj._rule.log:
log.warning('Invalid rule: More than one log')
return True
level = None
if "level" in attrs:
level = attrs["level"]
if level not in [ "emerg", "alert", "crit", "error",
"warning", "notice", "info", "debug" ]:
log.warning('Invalid rule: Invalid log level')
obj._rule_error = True
return True
prefix = attrs["prefix"] if "prefix" in attrs else None
obj._rule.log = rich.Rich_Log(prefix, level)
obj._limit_ok = obj._rule.log
elif name == "audit":
if not obj._rule:
log.warning('Invalid rule: Audit outside of rule')
return True
if obj._rule.audit:
log.warning("Invalid rule: More than one audit in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
obj._rule.audit = rich.Rich_Audit()
obj._limit_ok = obj._rule.audit
elif name == "rule":
family = None
priority = 0
if "family" in attrs:
family = attrs["family"]
if family not in [ "ipv4", "ipv6" ]:
log.warning('Invalid rule: Rule family "%s" invalid',
attrs["family"])
obj._rule_error = True
return True
if "priority" in attrs:
priority = int(attrs["priority"])
obj._rule = rich.Rich_Rule(family=family, priority=priority)
elif name == "limit":
if not obj._limit_ok:
log.warning('Invalid rule: Limit outside of action, log and audit')
obj._rule_error = True
return True
if obj._limit_ok.limit:
log.warning("Invalid rule: More than one limit in rule '%s', ignoring.",
str(obj._rule))
obj._rule_error = True
return True
value = attrs["value"]
obj._limit_ok.limit = rich.Rich_Limit(value, attrs.get("burst"))
else:
return False
return True
def common_endElement(obj, name):
if name == "rule":
if not obj._rule_error:
try:
obj._rule.check()
except Exception as e:
log.warning("%s: %s", e, str(obj._rule))
else:
if str(obj._rule) not in obj.item.rules_str:
obj.item.rules.append(obj._rule)
obj.item.rules_str.append(str(obj._rule))
else:
log.warning("Rule '%s' already set, ignoring.",
str(obj._rule))
obj._rule = None
obj._rule_error = False
elif name in [ "accept", "reject", "drop", "mark", "log", "audit" ]:
obj._limit_ok = None
def common_check_config(obj, config, item, all_config):
obj_type = "Policy" if isinstance(obj, Policy) else "Zone"
if item == "services" and obj.fw_config:
existing_services = obj.fw_config.get_services()
for service in config:
if service not in existing_services:
raise FirewallError(errors.INVALID_SERVICE,
"'%s' not among existing services" % \
service)
elif item == "ports":
for port in config:
check_port(port[0])
check_tcpudp(port[1])
elif item == "protocols":
for proto in config:
check_protocol(proto)
elif item == "icmp_blocks" and obj.fw_config:
existing_icmptypes = obj.fw_config.get_icmptypes()
for icmptype in config:
if icmptype not in existing_icmptypes:
raise FirewallError(errors.INVALID_ICMPTYPE,
"'%s' not among existing icmp types" % \
icmptype)
elif item == "forward_ports":
for fwd_port in config:
check_port(fwd_port[0])
check_tcpudp(fwd_port[1])
if not fwd_port[2] and not fwd_port[3]:
raise FirewallError(
errors.INVALID_FORWARD,
"'%s' is missing to-port AND to-addr " % fwd_port)
if fwd_port[2]:
check_port(fwd_port[2])
if fwd_port[3]:
if not checkIP(fwd_port[3]) and not checkIP6(fwd_port[3]):
raise FirewallError(
errors.INVALID_ADDR,
"to-addr '%s' is not a valid address" % fwd_port[3])
elif item == "source_ports":
for port in config:
check_port(port[0])
check_tcpudp(port[1])
elif item in ["rules_str", "rich_rules"]:
for rule in config:
obj_rich = rich.Rich_Rule(rule_str=rule)
if obj.fw_config and obj_rich.element and (isinstance(obj_rich.element, rich.Rich_IcmpBlock) or
isinstance(obj_rich.element, rich.Rich_IcmpType)):
existing_icmptypes = obj.fw_config.get_icmptypes()
if obj_rich.element.name not in existing_icmptypes:
raise FirewallError(errors.INVALID_ICMPTYPE,
"'%s' not among existing icmp types" % \
obj_rich.element.name)
elif obj_rich.family:
ict = obj.fw_config.get_icmptype(obj_rich.element.name)
if ict.destination and obj_rich.family not in ict.destination:
raise FirewallError(errors.INVALID_ICMPTYPE,
"rich rule family '%s' conflicts with icmp type '%s'" % \
(obj_rich.family, obj_rich.element.name))
elif obj.fw_config and isinstance(obj_rich.element, rich.Rich_Service):
existing_services = obj.fw_config.get_services()
if obj_rich.element.name not in existing_services:
raise FirewallError(
errors.INVALID_SERVICE,
"{} '{}': '{}' not among existing services".format(
obj_type, obj.name, obj_rich.element.name
),
)
def _handler_add_rich_limit(handler, limit):
d = {"value": limit.value}
burst = limit.burst
if burst is not None:
d["burst"] = burst
handler.simpleElement("limit", d)
def common_writer(obj, handler):
# short
if obj.short and obj.short != "":
handler.ignorableWhitespace(" ")
handler.startElement("short", { })
handler.characters(obj.short)
handler.endElement("short")
handler.ignorableWhitespace("\n")
# description
if obj.description and obj.description != "":
handler.ignorableWhitespace(" ")
handler.startElement("description", { })
handler.characters(obj.description)
handler.endElement("description")
handler.ignorableWhitespace("\n")
# services
for service in uniqify(obj.services):
handler.ignorableWhitespace(" ")
handler.simpleElement("service", { "name": service })
handler.ignorableWhitespace("\n")
# ports
for port in uniqify(obj.ports):
handler.ignorableWhitespace(" ")
handler.simpleElement("port", { "port": port[0], "protocol": port[1] })
handler.ignorableWhitespace("\n")
# protocols
for protocol in uniqify(obj.protocols):
handler.ignorableWhitespace(" ")
handler.simpleElement("protocol", { "value": protocol })
handler.ignorableWhitespace("\n")
# icmp-blocks
for icmp in uniqify(obj.icmp_blocks):
handler.ignorableWhitespace(" ")
handler.simpleElement("icmp-block", { "name": icmp })
handler.ignorableWhitespace("\n")
# masquerade
if obj.masquerade:
handler.ignorableWhitespace(" ")
handler.simpleElement("masquerade", { })
handler.ignorableWhitespace("\n")
# forward-ports
for forward in uniqify(obj.forward_ports):
handler.ignorableWhitespace(" ")
attrs = { "port": forward[0], "protocol": forward[1] }
if forward[2] and forward[2] != "" :
attrs["to-port"] = forward[2]
if forward[3] and forward[3] != "" :
attrs["to-addr"] = forward[3]
handler.simpleElement("forward-port", attrs)
handler.ignorableWhitespace("\n")
# source-ports
for port in uniqify(obj.source_ports):
handler.ignorableWhitespace(" ")
handler.simpleElement("source-port", { "port": port[0],
"protocol": port[1] })
handler.ignorableWhitespace("\n")
# rules
for rule in obj.rules:
attrs = { }
if rule.family:
attrs["family"] = rule.family
if rule.priority != 0:
attrs["priority"] = str(rule.priority)
handler.ignorableWhitespace(" ")
handler.startElement("rule", attrs)
handler.ignorableWhitespace("\n")
# source
if rule.source:
attrs = { }
if rule.source.addr:
attrs["address"] = rule.source.addr
if rule.source.mac:
attrs["mac"] = rule.source.mac
if rule.source.ipset:
attrs["ipset"] = rule.source.ipset
if rule.source.invert:
attrs["invert"] = "True"
handler.ignorableWhitespace(" ")
handler.simpleElement("source", attrs)
handler.ignorableWhitespace("\n")
# destination
if rule.destination:
attrs = { }
if rule.destination.addr:
attrs["address"] = rule.destination.addr
if rule.destination.ipset:
attrs["ipset"] = rule.destination.ipset
if rule.destination.invert:
attrs["invert"] = "True"
handler.ignorableWhitespace(" ")
handler.simpleElement("destination", attrs)
handler.ignorableWhitespace("\n")
# element
if rule.element:
element = ""
attrs = { }
if type(rule.element) == rich.Rich_Service:
element = "service"
attrs["name"] = rule.element.name
elif type(rule.element) == rich.Rich_Port:
element = "port"
attrs["port"] = rule.element.port
attrs["protocol"] = rule.element.protocol
elif type(rule.element) == rich.Rich_Protocol:
element = "protocol"
attrs["value"] = rule.element.value
elif type(rule.element) == rich.Rich_Masquerade:
element = "masquerade"
elif type(rule.element) == rich.Rich_IcmpBlock:
element = "icmp-block"
attrs["name"] = rule.element.name
elif type(rule.element) == rich.Rich_IcmpType:
element = "icmp-type"
attrs["name"] = rule.element.name
elif type(rule.element) == rich.Rich_ForwardPort:
element = "forward-port"
attrs["port"] = rule.element.port
attrs["protocol"] = rule.element.protocol
if rule.element.to_port != "":
attrs["to-port"] = rule.element.to_port
if rule.element.to_address != "":
attrs["to-addr"] = rule.element.to_address
elif type(rule.element) == rich.Rich_SourcePort:
element = "source-port"
attrs["port"] = rule.element.port
attrs["protocol"] = rule.element.protocol
else:
raise FirewallError(
errors.INVALID_OBJECT,
"Unknown element '%s' in obj_writer" % type(rule.element))
handler.ignorableWhitespace(" ")
handler.simpleElement(element, attrs)
handler.ignorableWhitespace("\n")
# rule.element
# log
if rule.log:
attrs = { }
if rule.log.prefix:
attrs["prefix"] = rule.log.prefix
if rule.log.level:
attrs["level"] = rule.log.level
if rule.log.limit:
handler.ignorableWhitespace(" ")
handler.startElement("log", attrs)
handler.ignorableWhitespace("\n ")
_handler_add_rich_limit(handler, rule.log.limit)
handler.ignorableWhitespace("\n ")
handler.endElement("log")
else:
handler.ignorableWhitespace(" ")
handler.simpleElement("log", attrs)
handler.ignorableWhitespace("\n")
# audit
if rule.audit:
attrs = {}
if rule.audit.limit:
handler.ignorableWhitespace(" ")
handler.startElement("audit", { })
handler.ignorableWhitespace("\n ")
_handler_add_rich_limit(handler, rule.audit.limit)
handler.ignorableWhitespace("\n ")
handler.endElement("audit")
else:
handler.ignorableWhitespace(" ")
handler.simpleElement("audit", attrs)
handler.ignorableWhitespace("\n")
# action
if rule.action:
action = ""
attrs = { }
if type(rule.action) == rich.Rich_Accept:
action = "accept"
elif type(rule.action) == rich.Rich_Reject:
action = "reject"
if rule.action.type:
attrs["type"] = rule.action.type
elif type(rule.action) == rich.Rich_Drop:
action = "drop"
elif type(rule.action) == rich.Rich_Mark:
action = "mark"
attrs["set"] = rule.action.set
else:
log.warning("Unknown action '%s'", type(rule.action))
if rule.action.limit:
handler.ignorableWhitespace(" ")
handler.startElement(action, attrs)
handler.ignorableWhitespace("\n ")
_handler_add_rich_limit(handler, rule.action.limit)
handler.ignorableWhitespace("\n ")
handler.endElement(action)
else:
handler.ignorableWhitespace(" ")
handler.simpleElement(action, attrs)
handler.ignorableWhitespace("\n")
handler.ignorableWhitespace(" ")
handler.endElement("rule")
handler.ignorableWhitespace("\n")
class Policy(IO_Object):
priority_min = -32768
priority_max = 32767
priority_default = DEFAULT_POLICY_PRIORITY
priority_reserved = [0]
IMPORT_EXPORT_STRUCTURE = (
( "version", "" ), # s
( "short", "" ), # s
( "description", "" ), # s
( "target", "" ), # s
( "services", [ "", ], ), # as
( "ports", [ ( "", "" ), ], ), # a(ss)
( "icmp_blocks", [ "", ], ), # as
( "masquerade", False ), # b
( "forward_ports", [ ( "", "", "", "" ), ], ), # a(ssss)
( "rich_rules", [ "" ] ), # as
( "protocols", [ "", ], ), # as
( "source_ports", [ ( "", "" ), ], ), # a(ss)
( "priority", 0 ), # i
( "ingress_zones", [ "" ] ), # as
( "egress_zones", [ "" ] ), # as
)
ADDITIONAL_ALNUM_CHARS = [ "_", "-", "/" ]
PARSER_REQUIRED_ELEMENT_ATTRS = {
"short": None,
"description": None,
"policy": ["target"],
"service": [ "name" ],
"port": [ "port", "protocol" ],
"icmp-block": [ "name" ],
"icmp-type": [ "name" ],
"masquerade": None,
"forward-port": [ "port", "protocol" ],
"rule": None,
"source": None,
"destination": None,
"protocol": [ "value" ],
"source-port": [ "port", "protocol" ],
"log": None,
"audit": None,
"accept": None,
"reject": None,
"drop": None,
"mark": [ "set" ],
"limit": [ "value" ],
"ingress-zone": [ "name" ],
"egress-zone": [ "name" ],
}
PARSER_OPTIONAL_ELEMENT_ATTRS = {
"policy": [ "version", "priority" ],
"forward-port": [ "to-port", "to-addr" ],
"rule": [ "family", "priority" ],
"source": [ "address", "mac", "invert", "family", "ipset" ],
"destination": [ "address", "invert", "ipset" ],
"log": [ "prefix", "level" ],
"reject": [ "type" ],
"limit": ["burst"],
}
def __init__(self):
super(Policy, self).__init__()
self.version = ""
self.short = ""
self.description = ""
self.target = DEFAULT_POLICY_TARGET
self.services = [ ]
self.ports = [ ]
self.protocols = [ ]
self.icmp_blocks = [ ]
self.masquerade = False
self.forward_ports = [ ]
self.source_ports = [ ]
self.fw_config = None # to be able to check services and a icmp_blocks
self.rules = [ ]
self.rules_str = [ ]
self.applied = False
self.priority = self.priority_default
self.derived_from_zone = None
self.ingress_zones = []
self.egress_zones = []
def cleanup(self):
self.version = ""
self.short = ""
self.description = ""
self.target = DEFAULT_POLICY_TARGET
del self.services[:]
del self.ports[:]
del self.protocols[:]
del self.icmp_blocks[:]
self.masquerade = False
del self.forward_ports[:]
del self.source_ports[:]
self.fw_config = None # to be able to check services and a icmp_blocks
del self.rules[:]
del self.rules_str[:]
self.applied = False
self.priority = self.priority_default
del self.ingress_zones[:]
del self.egress_zones[:]
def __getattr__(self, name):
if name == "rich_rules":
return self.rules_str
else:
return getattr(super(Policy, self), name)
def __setattr__(self, name, value):
if name == "rich_rules":
self.rules = [rich.Rich_Rule(rule_str=s) for s in value]
# must convert back to string to get the canonical string.
self.rules_str = [str(s) for s in self.rules]
else:
super(Policy, self).__setattr__(name, value)
def _check_config(self, config, item, all_config):
common_check_config(self, config, item, all_config)
if item == "target":
if config not in POLICY_TARGETS:
raise FirewallError(errors.INVALID_TARGET, "'%s' is invalid target" % (config))
elif item == "priority":
if config in self.priority_reserved or \
config > self.priority_max or \
config < self.priority_min:
raise FirewallError(errors.INVALID_PRIORITY, "%d is invalid priority. Must be in range [%d, %d]. The following are reserved: %s" %
(config, self.priority_min, self.priority_max, self.priority_reserved))
elif item in ["ingress_zones", "egress_zones"]:
existing_zones = ["ANY", "HOST"]
if self.fw_config:
existing_zones += self.fw_config.get_zones()
for zone in config:
if zone not in existing_zones:
raise FirewallError(errors.INVALID_ZONE,
"'%s' not among existing zones" % (zone))
if ((zone not in ["ANY", "HOST"] and (set(["ANY", "HOST"]) & set(config))) or \
(zone in ["ANY", "HOST"] and (set(config) - set([zone])))):
raise FirewallError(errors.INVALID_ZONE,
"'%s' may only contain one of: many regular zones, ANY, or HOST" % (item))
if zone == "HOST" and \
((item == "ingress_zones" and "egress_zones" in all_config and "HOST" in all_config["egress_zones"]) or \
(item == "egress_zones" and "ingress_zones" in all_config and "HOST" in all_config["ingress_zones"])):
raise FirewallError(errors.INVALID_ZONE,
"'HOST' can only appear in either ingress or egress zones, but not both")
elif item == "masquerade" and config:
if "egress_zones" in all_config and "HOST" in all_config["egress_zones"]:
raise FirewallError(errors.INVALID_ZONE, "'masquerade' is invalid for egress zone 'HOST'")
elif "ingress_zones" in all_config:
if "HOST" in all_config["ingress_zones"]:
raise FirewallError(errors.INVALID_ZONE, "'masquerade' is invalid for ingress zone 'HOST'")
for zone in all_config["ingress_zones"]:
if zone == "ANY":
continue
z_obj = self.fw_config.get_zone(zone)
if self.fw_config and "interfaces" in self.fw_config.get_zone_config_dict(z_obj):
raise FirewallError(errors.INVALID_ZONE, "'masquerade' cannot be used in a policy if an ingress zone has assigned interfaces")
elif item == "rich_rules":
for rule in config:
obj = rich.Rich_Rule(rule_str=rule)
if obj.element and isinstance(obj.element, rich.Rich_Masquerade):
if "egress_zones" in all_config and "HOST" in all_config["egress_zones"]:
raise FirewallError(errors.INVALID_ZONE, "'masquerade' is invalid for egress zone 'HOST'")
elif "ingress_zones" in all_config:
if "HOST" in all_config["ingress_zones"]:
raise FirewallError(errors.INVALID_ZONE, "'masquerade' is invalid for ingress zone 'HOST'")
for zone in all_config["ingress_zones"]:
if zone == "ANY":
continue
z_obj = self.fw_config.get_zone(zone)
if self.fw_config and "interfaces" in self.fw_config.get_zone_config_dict(z_obj):
raise FirewallError(errors.INVALID_ZONE, "'masquerade' cannot be used in a policy if an ingress zone has assigned interfaces")
elif obj.element and isinstance(obj.element, rich.Rich_ForwardPort):
if "egress_zones" in all_config:
if "HOST" in all_config["egress_zones"]:
if obj.element.to_address:
raise FirewallError(errors.INVALID_FORWARD, "A 'forward-port' with 'to-addr' is invalid for egress zone 'HOST'")
elif all_config["egress_zones"]:
if not obj.element.to_address:
raise FirewallError(errors.INVALID_FORWARD, "'forward-port' requires 'to-addr' if egress zone is 'ANY' or a zone")
if "ANY" not in all_config["egress_zones"]:
for zone in all_config["egress_zones"]:
z_obj = self.fw_config.get_zone(zone)
if self.fw_config and "interfaces" in self.fw_config.get_zone_config_dict(z_obj):
raise FirewallError(errors.INVALID_ZONE, "'forward-port' cannot be used in a policy if an egress zone has assigned interfaces")
elif obj.action and isinstance(obj.action, rich.Rich_Mark):
if "egress_zones" in all_config:
for zone in all_config["egress_zones"]:
if zone in ["ANY", "HOST"]:
continue
z_obj = self.fw_config.get_zone(zone)
if self.fw_config and "interfaces" in self.fw_config.get_zone_config_dict(z_obj):
raise FirewallError(errors.INVALID_ZONE, "'mark' action cannot be used in a policy if an egress zone has assigned interfaces")
elif item == "forward_ports":
for fwd_port in config:
if "ingress_zones" in all_config and "HOST" in all_config["ingress_zones"]:
raise FirewallError(errors.INVALID_ZONE, "'forward-port' is invalid for ingress zone 'HOST'")
elif "egress_zones" in all_config:
if "HOST" in all_config["egress_zones"]:
if fwd_port[3]:
raise FirewallError(errors.INVALID_FORWARD, "A 'forward-port' with 'to-addr' is invalid for egress zone 'HOST'")
elif all_config["egress_zones"]:
if not fwd_port[3]:
raise FirewallError(errors.INVALID_FORWARD, "'forward-port' requires 'to-addr' if egress zone is 'ANY' or a zone")
if "ANY" not in all_config["egress_zones"]:
for zone in all_config["egress_zones"]:
z_obj = self.fw_config.get_zone(zone)
if self.fw_config and "interfaces" in self.fw_config.get_zone_config_dict(z_obj):
raise FirewallError(errors.INVALID_ZONE, "'forward-port' cannot be used in a policy if an egress zone has assigned interfaces")
def check_name(self, name):
super(Policy, self).check_name(name)
if name.startswith('/'):
raise FirewallError(errors.INVALID_NAME,
"'%s' can't start with '/'" % name)
elif name.endswith('/'):
raise FirewallError(errors.INVALID_NAME,
"'%s' can't end with '/'" % name)
elif name.count('/') > 1:
raise FirewallError(errors.INVALID_NAME,
"more than one '/' in '%s'" % name)
else:
if "/" in name:
checked_name = name[:name.find('/')]
else:
checked_name = name
if len(checked_name) > max_policy_name_len():
raise FirewallError(errors.INVALID_NAME,
"Policy of '%s' has %d chars, max is %d" % (
name, len(checked_name),
max_policy_name_len()))
if self.fw_config:
if checked_name in self.fw_config.get_zones():
raise FirewallError(errors.NAME_CONFLICT, "Policies can't have the same name as a zone.")
# PARSER
class policy_ContentHandler(IO_Object_ContentHandler):
def __init__(self, item):
IO_Object_ContentHandler.__init__(self, item)
self._rule = None
self._rule_error = False
self._limit_ok = None
def startElement(self, name, attrs):
IO_Object_ContentHandler.startElement(self, name, attrs)
if self._rule_error:
return
self.item.parser_check_element_attrs(name, attrs)
if common_startElement(self, name, attrs):
return
elif name == "policy":
if "version" in attrs:
self.item.version = attrs["version"]
if "priority" in attrs:
self.item.priority = int(attrs["priority"])
if "target" in attrs:
target = attrs["target"]
if target not in POLICY_TARGETS:
raise FirewallError(errors.INVALID_TARGET, target)
if target:
self.item.target = target
elif name == "ingress-zone":
if attrs["name"] not in self.item.ingress_zones:
self.item.ingress_zones.append(attrs["name"])
else:
log.warning("Ingress zone '%s' already set, ignoring.", attrs["name"])
elif name == "egress-zone":
if attrs["name"] not in self.item.egress_zones:
self.item.egress_zones.append(attrs["name"])
else:
log.warning("Egress zone '%s' already set, ignoring.", attrs["name"])
elif name == "source":
if not self._rule:
log.warning('Invalid rule: Source outside of rule')
self._rule_error = True
return
if self._rule.source:
log.warning("Invalid rule: More than one source in rule '%s', ignoring.",
str(self._rule))
self._rule_error = True
return
invert = False
if "invert" in attrs and \
attrs["invert"].lower() in [ "yes", "true" ]:
invert = True
addr = mac = ipset = None
if "address" in attrs:
addr = attrs["address"]
if "mac" in attrs:
mac = attrs["mac"]
if "ipset" in attrs:
ipset = attrs["ipset"]
self._rule.source = rich.Rich_Source(addr, mac, ipset,
invert=invert)
return
else:
log.warning("Unknown XML element '%s'", name)
return
def endElement(self, name):
IO_Object_ContentHandler.endElement(self, name)
common_endElement(self, name)
def policy_reader(filename, path, no_check_name=False):
policy = Policy()
if not filename.endswith(".xml"):
raise FirewallError(errors.INVALID_NAME,
"'%s' is missing .xml suffix" % filename)
policy.name = filename[:-4]
if not no_check_name:
policy.check_name(policy.name)
policy.filename = filename
policy.path = path
policy.builtin = False if path.startswith(config.ETC_FIREWALLD) else True
policy.default = policy.builtin
handler = policy_ContentHandler(policy)
parser = sax.make_parser()
parser.setContentHandler(handler)
name = "%s/%s" % (path, filename)
with open(name, "rb") as f:
source = sax.InputSource(None)
source.setByteStream(f)
try:
parser.parse(source)
except sax.SAXParseException as msg:
raise FirewallError(errors.INVALID_POLICY,
"not a valid policy file: %s" % \
msg.getException())
del handler
del parser
return policy
def policy_writer(policy, path=None):
_path = path if path else policy.path
if policy.filename:
name = "%s/%s" % (_path, policy.filename)
else:
name = "%s/%s.xml" % (_path, policy.name)
if os.path.exists(name):
try:
shutil.copy2(name, "%s.old" % name)
except Exception as msg:
log.error("Backup of file '%s' failed: %s", name, msg)
dirpath = os.path.dirname(name)
if dirpath.startswith(config.ETC_FIREWALLD) and not os.path.exists(dirpath):
if not os.path.exists(config.ETC_FIREWALLD):
os.mkdir(config.ETC_FIREWALLD, 0o750)
os.mkdir(dirpath, 0o750)
f = io.open(name, mode='wt', encoding='UTF-8')
handler = IO_Object_XMLGenerator(f)
handler.startDocument()
# start policy element
attrs = {}
if policy.version and policy.version != "":
attrs["version"] = policy.version
if policy.priority != policy.priority_default:
attrs["priority"] = str(policy.priority)
attrs["target"] = policy.target
handler.startElement("policy", attrs)
handler.ignorableWhitespace("\n")
common_writer(policy, handler)
# ingress-zones
for zone in uniqify(policy.ingress_zones):
handler.ignorableWhitespace(" ")
handler.simpleElement("ingress-zone", { "name": zone })
handler.ignorableWhitespace("\n")
# egress-zones
for zone in uniqify(policy.egress_zones):
handler.ignorableWhitespace(" ")
handler.simpleElement("egress-zone", { "name": zone })
handler.ignorableWhitespace("\n")
# end policy element
handler.endElement("policy")
handler.ignorableWhitespace("\n")
handler.endDocument()
f.close()
del handler
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