def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for backend in self.enabled_backends():
rules = backend.build_default_rules(self._log_denied)
transaction.add_rules(backend, rules)
ipv6_backend = self.get_backend_by_ipv("ipv6")
if self.ipv6_rpfilter_enabled and \
"raw" in ipv6_backend.get_available_tables():
# Execute existing transaction
transaction.execute(True)
# Start new transaction
transaction.clear()
rules = ipv6_backend.build_rpfilter_rules(self._log_denied)
transaction.add_rules(ipv6_backend, rules)
# Execute ipv6_rpfilter transaction, it might fail
try:
transaction.execute(True)
except FirewallError as msg:
log.warning("Applying rules for ipv6_rpfilter failed: %s", msg)
# Start new transaction
transaction.clear()
else:
if use_transaction is None:
transaction.execute(True)
def flush(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Flushing rule set")
if self.ip4tables_enabled:
try:
self.ip4tables_backend.flush(transaction)
except Exception as e:
log.error("Failed to flush ipv4 firewall: %s" % e)
if self.ip6tables_enabled:
try:
self.ip6tables_backend.flush(transaction)
except Exception as e:
log.error("Failed to flush ipv6 firewall: %s" % e)
if self.ebtables_enabled:
try:
self.ebtables_backend.flush(transaction)
except Exception as e:
log.error("Failed to flush eb firewall: %s" % e)
if use_transaction is None:
transaction.execute(True)
def set_policy(self, policy, which="used", use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Setting policy to '%s'", policy)
if self.ip4tables_enabled:
try:
self.ip4tables_backend.set_policy(policy, which, transaction)
except Exception as e:
log.error("Failed to set policy of ipv4 firewall: %s" % e)
if self.ip6tables_enabled:
try:
self.ip6tables_backend.set_policy(policy, which, transaction)
except Exception as e:
log.error("Failed to set policy of ipv6 firewall: %s" % e)
if self.ebtables_enabled:
try:
self.ebtables_backend.set_policy(policy, which, transaction)
except Exception as e:
log.error("Failed to set policy of eb firewall: %s" % e)
if use_transaction is None:
transaction.execute(True)
def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for ipv in [ "ipv4", "ipv6", "eb" ]:
self.__apply_default_rules(ipv, transaction)
if self.ipv6_rpfilter_enabled and \
"raw" in self.get_available_tables("ipv6"):
# Execute existing transaction
transaction.execute(True)
# Start new transaction
transaction.clear()
self.ip6tables_backend.apply_rpfilter_rules(transaction, self._log_denied)
# Execute ipv6_rpfilter transaction, it might fail
try:
transaction.execute(True)
except FirewallError as msg:
log.warning("Applying rules for ipv6_rpfilter failed: %s", msg)
# Start new transaction
transaction.clear()
else:
if use_transaction is None:
transaction.execute(True)
def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for backend in self.enabled_backends():
rules = backend.build_default_rules(self._log_denied)
transaction.add_rules(backend, rules)
ipv6_backend = self.get_backend_by_ipv("ipv6")
if "raw" in ipv6_backend.get_available_tables():
if self.ipv6_rpfilter_enabled:
rules = ipv6_backend.build_rpfilter_rules(self._log_denied)
transaction.add_rules(ipv6_backend, rules)
if self._rfc3964_ipv4:
# Flush due to iptables-restore (nftables) bug tiggered when
# specifying same index multiple times in same batch
# rhbz 1647925
transaction.execute(True)
transaction.clear()
rules = ipv6_backend.build_rfc3964_ipv4_rules()
transaction.add_rules(ipv6_backend, rules)
else:
if use_transaction is None:
transaction.execute(True)
def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for ipv in ["ipv4", "ipv6", "eb"]:
self.__apply_default_rules(ipv, transaction)
if self.ipv6_rpfilter_enabled and \
"raw" in self.get_available_tables("ipv6"):
# here is no check for ebtables.restore_noflush_option needed
# as ebtables is not used in here
transaction.add_rule("ipv6", [
"-I", "PREROUTING", "1", "-t", "raw", "-p", "ipv6-icmp",
"--icmpv6-type=router-advertisement", "-j", "ACCEPT"
]) # RHBZ#1058505
transaction.add_rule("ipv6", [
"-I", "PREROUTING", "2", "-t", "raw", "-m", "rpfilter",
"--invert", "-j", "DROP"
])
if self._log_denied != "off":
transaction.add_rule("ipv6", [
"-I", "PREROUTING", "2", "-t", "raw", "-m", "rpfilter",
"--invert", "-j", "LOG", "--log-prefix", "rpfilter_DROP: "
])
if use_transaction is None:
transaction.execute(True)
def apply_default_tables(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for backend in self.enabled_backends():
transaction.add_rules(backend, backend.build_default_tables())
if use_transaction is None:
transaction.execute(True)
def set_policy(self, policy, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Setting policy to '%s'", policy)
for backend in self.enabled_backends():
rules = backend.build_set_policy_rules(policy)
transaction.add_rules(backend, rules)
if use_transaction is None:
transaction.execute(True)
def flush(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Flushing rule set")
for backend in self.all_backends():
rules = backend.build_flush_rules()
transaction.add_rules(backend, rules)
if use_transaction is None:
transaction.execute(True)
def set_policy(self, policy, which="used", use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Setting policy to '%s'", policy)
for ipv in self.enabled_backends():
try:
self.get_ipv_backend(ipv).set_policy(policy, which, transaction)
except Exception as e:
log.error("Failed to set policy of %s firewall: %s" % (ipv, e))
if use_transaction is None:
transaction.execute(True)
def flush(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
log.debug1("Flushing rule set")
for ipv in self.enabled_backends():
try:
self.get_ipv_backend(ipv).flush(transaction)
except Exception as e:
log.error("Failed to flush %s firewall: %s" % (ipv, e))
if use_transaction is None:
transaction.execute(True)
def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for ipv in [ "ipv4", "ipv6", "eb" ]:
self.__apply_default_rules(ipv, transaction)
if self.ipv6_rpfilter_enabled and \
"raw" in self.get_available_tables("ipv6"):
# Execute existing transaction
transaction.execute(True)
# Start new transaction
transaction.clear()
# here is no check for ebtables.restore_noflush_option needed
# as ebtables is not used in here
transaction.add_rule("ipv6",
[ "-I", "PREROUTING", "1", "-t", "raw",
"-p", "ipv6-icmp",
"--icmpv6-type=router-advertisement",
"-j", "ACCEPT" ]) # RHBZ#1058505
transaction.add_rule("ipv6",
[ "-I", "PREROUTING", "2", "-t", "raw",
"-m", "rpfilter", "--invert", "-j", "DROP" ])
if self._log_denied != "off":
transaction.add_rule("ipv6",
[ "-I", "PREROUTING", "2", "-t", "raw",
"-m", "rpfilter", "--invert",
"-j", "LOG",
"--log-prefix", "rpfilter_DROP: " ])
# Execute ipv6_rpfilter transaction, it might fail
try:
transaction.execute(True)
except FirewallError as msg:
log.warning("Applying rules for ipv6_rpfilter failed: %s", msg)
# Start new transaction
transaction.clear()
else:
if use_transaction is None:
transaction.execute(True)
def apply_default_rules(self, use_transaction=None):
if use_transaction is None:
transaction = FirewallTransaction(self)
else:
transaction = use_transaction
for backend in self.enabled_backends():
rules = backend.build_default_rules(self._log_denied)
transaction.add_rules(backend, rules)
if self.is_ipv_enabled("ipv6"):
ipv6_backend = self.get_backend_by_ipv("ipv6")
if "raw" in ipv6_backend.get_available_tables():
if self.ipv6_rpfilter_enabled:
rules = ipv6_backend.build_rpfilter_rules(self._log_denied)
transaction.add_rules(ipv6_backend, rules)
if self.is_ipv_enabled("ipv6") and self._rfc3964_ipv4:
rules = ipv6_backend.build_rfc3964_ipv4_rules()
transaction.add_rules(ipv6_backend, rules)
if use_transaction is None:
transaction.execute(True)
def _start(self, reload=False, complete_reload=False):
# initialize firewall
default_zone = config.FALLBACK_ZONE
# load firewalld config
log.debug1("Loading firewalld config file '%s'", config.FIREWALLD_CONF)
try:
self._firewalld_conf.read()
except Exception as msg:
log.warning(msg)
log.warning("Using fallback firewalld configuration settings.")
else:
if self._firewalld_conf.get("DefaultZone"):
default_zone = self._firewalld_conf.get("DefaultZone")
if self._firewalld_conf.get("MinimalMark"):
self._min_mark = int(self._firewalld_conf.get("MinimalMark"))
if self._firewalld_conf.get("CleanupOnExit"):
value = self._firewalld_conf.get("CleanupOnExit")
if value is not None and value.lower() in ["no", "false"]:
self.cleanup_on_exit = False
log.debug1("CleanupOnExit is set to '%s'",
self.cleanup_on_exit)
if self._firewalld_conf.get("Lockdown"):
value = self._firewalld_conf.get("Lockdown")
if value is not None and value.lower() in ["yes", "true"]:
log.debug1("Lockdown is enabled")
try:
self.policies.enable_lockdown()
except FirewallError:
# already enabled, this is probably reload
pass
if self._firewalld_conf.get("IPv6_rpfilter"):
value = self._firewalld_conf.get("IPv6_rpfilter")
if value is not None:
if value.lower() in ["no", "false"]:
self.ipv6_rpfilter_enabled = False
if value.lower() in ["yes", "true"]:
self.ipv6_rpfilter_enabled = True
if self.ipv6_rpfilter_enabled:
log.debug1("IPv6 rpfilter is enabled")
else:
log.debug1("IPV6 rpfilter is disabled")
if self._firewalld_conf.get("IndividualCalls"):
value = self._firewalld_conf.get("IndividualCalls")
if value is not None and value.lower() in ["yes", "true"]:
log.debug1("IndividualCalls is enabled")
self._individual_calls = True
if self._firewalld_conf.get("LogDenied"):
value = self._firewalld_conf.get("LogDenied")
if value is None or value.lower() == "no":
self._log_denied = "off"
else:
self._log_denied = value.lower()
log.debug1("LogDenied is set to '%s'", self._log_denied)
if self._firewalld_conf.get("AutomaticHelpers"):
value = self._firewalld_conf.get("AutomaticHelpers")
if value is not None:
if value.lower() in ["no", "false"]:
self._automatic_helpers = "no"
elif value.lower() in ["yes", "true"]:
self._automatic_helpers = "yes"
else:
self._automatic_helpers = value.lower()
log.debug1("AutomaticHelpers is set to '%s'",
self._automatic_helpers)
if self._firewalld_conf.get("FirewallBackend"):
self._firewall_backend = self._firewalld_conf.get(
"FirewallBackend")
log.debug1("FirewallBackend is set to '%s'",
self._firewall_backend)
if self._firewalld_conf.get("FlushAllOnReload"):
value = self._firewalld_conf.get("FlushAllOnReload")
if value.lower() in ["no", "false"]:
self._flush_all_on_reload = False
else:
self._flush_all_on_reload = True
log.debug1("FlushAllOnReload is set to '%s'",
self._flush_all_on_reload)
self.config.set_firewalld_conf(copy.deepcopy(self._firewalld_conf))
self._select_firewall_backend(self._firewall_backend)
self._start_check()
# load lockdown whitelist
log.debug1("Loading lockdown whitelist")
try:
self.policies.lockdown_whitelist.read()
except Exception as msg:
if self.policies.query_lockdown():
log.error("Failed to load lockdown whitelist '%s': %s",
self.policies.lockdown_whitelist.filename, msg)
else:
log.debug1("Failed to load lockdown whitelist '%s': %s",
self.policies.lockdown_whitelist.filename, msg)
# copy policies to config interface
self.config.set_policies(copy.deepcopy(self.policies))
# load ipset files
self._loader(config.FIREWALLD_IPSETS, "ipset")
self._loader(config.ETC_FIREWALLD_IPSETS, "ipset")
# load icmptype files
self._loader(config.FIREWALLD_ICMPTYPES, "icmptype")
self._loader(config.ETC_FIREWALLD_ICMPTYPES, "icmptype")
if len(self.icmptype.get_icmptypes()) == 0:
log.error("No icmptypes found.")
# load helper files
self._loader(config.FIREWALLD_HELPERS, "helper")
self._loader(config.ETC_FIREWALLD_HELPERS, "helper")
# load service files
self._loader(config.FIREWALLD_SERVICES, "service")
self._loader(config.ETC_FIREWALLD_SERVICES, "service")
if len(self.service.get_services()) == 0:
log.error("No services found.")
# load zone files
self._loader(config.FIREWALLD_ZONES, "zone")
self._loader(config.ETC_FIREWALLD_ZONES, "zone")
if len(self.zone.get_zones()) == 0:
log.fatal("No zones found.")
sys.exit(1)
# check minimum required zones
error = False
for z in ["block", "drop", "trusted"]:
if z not in self.zone.get_zones():
log.fatal("Zone '%s' is not available.", z)
error = True
if error:
sys.exit(1)
# check if default_zone is a valid zone
if default_zone not in self.zone.get_zones():
if "public" in self.zone.get_zones():
zone = "public"
elif "external" in self.zone.get_zones():
zone = "external"
else:
zone = "block" # block is a base zone, therefore it has to exist
log.error("Default zone '%s' is not valid. Using '%s'.",
default_zone, zone)
default_zone = zone
else:
log.debug1("Using default zone '%s'", default_zone)
# load direct rules
obj = Direct(config.FIREWALLD_DIRECT)
if os.path.exists(config.FIREWALLD_DIRECT):
log.debug1("Loading direct rules file '%s'" % \
config.FIREWALLD_DIRECT)
try:
obj.read()
except Exception as msg:
log.error("Failed to load direct rules file '%s': %s",
config.FIREWALLD_DIRECT, msg)
self.direct.set_permanent_config(obj)
self.config.set_direct(copy.deepcopy(obj))
# automatic helpers
#
# NOTE: must force loading of nf_conntrack to make sure the values are
# available in /proc
module_return = self.handle_modules(["nf_conntrack"], True)
if module_return:
log.error("Failed to load nf_conntrack module: %s" %
module_return[1])
sys.exit(1)
if self._automatic_helpers != "system":
functions.set_nf_conntrack_helper_setting(
self._automatic_helpers == "yes")
self.nf_conntrack_helper_setting = \
functions.get_nf_conntrack_helper_setting()
# check if needed tables are there
self._check_tables()
if log.getDebugLogLevel() > 0:
# get time before flushing and applying
tm1 = time.time()
# Start transaction
transaction = FirewallTransaction(self)
# flush rules
self.flush(use_transaction=transaction)
# If modules need to be unloaded in complete reload or if there are
# ipsets to get applied, limit the transaction to flush.
#
# Future optimization for the ipset case in reload: The transaction
# only needs to be split here if there are conflicting ipset types in
# exsting ipsets and the configuration in firewalld.
if (reload and complete_reload) or \
(self.ipset_enabled and self.ipset.has_ipsets()):
transaction.execute(True)
transaction.clear()
# complete reload: unload modules also
if reload and complete_reload:
log.debug1("Unloading firewall modules")
self.modules_backend.unload_firewall_modules()
self.apply_default_tables(use_transaction=transaction)
transaction.execute(True)
transaction.clear()
# apply settings for loaded ipsets while reloading here
if self.ipset_enabled and self.ipset.has_ipsets():
log.debug1("Applying ipsets")
self.ipset.apply_ipsets()
# Start or continue with transaction
# apply default rules
log.debug1("Applying default rule set")
self.apply_default_rules(use_transaction=transaction)
# apply settings for loaded zones
log.debug1("Applying used zones")
self.zone.apply_zones(use_transaction=transaction)
self._default_zone = self.check_zone(default_zone)
self.zone.change_default_zone(None,
self._default_zone,
use_transaction=transaction)
# Execute transaction
transaction.execute(True)
# Start new transaction for direct rules
transaction.clear()
# apply direct chains, rules and passthrough rules
if self.direct.has_configuration():
log.debug1("Applying direct chains rules and passthrough rules")
self.direct.apply_direct(transaction)
# since direct rules are easy to make syntax errors lets highlight
# the cause if the transaction fails.
try:
transaction.execute(True)
transaction.clear()
except FirewallError as e:
raise FirewallError(e.code,
"Direct: %s" % (e.msg if e.msg else ""))
except Exception:
raise
del transaction
if log.getDebugLogLevel() > 1:
# get time after flushing and applying
tm2 = time.time()
log.debug2("Flushing and applying took %f seconds" % (tm2 - tm1))
def new_transaction(self):
return FirewallTransaction(self._fw)
def new_transaction(self):
t = FirewallTransaction(self._fw)
t.add_pre(self._fw.full_check_config)
return t