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# gp_firewalld_ext samba gpo policy
# Copyright (C) David Mulder <dmulder@suse.com> 2021
#
# 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 3 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 os
from subprocess import Popen, PIPE
from shutil import which
import json
from samba.gp.gpclass import gp_pol_ext, gp_applier
from samba.gp.util.logging import log
def firewall_cmd(*args):
fw_cmd = which('firewall-cmd')
if fw_cmd is not None:
cmd = [fw_cmd]
cmd.extend(list(args))
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
stdoutdata, _ = p.communicate()
return p.returncode, stdoutdata
else:
return -1, 'firewall-cmd not found'
def rule_segment_parse(name, rule_segment):
if isinstance(rule_segment, str):
return ('%s=%s' % (name, rule_segment)) + ' '
else:
return '%s %s ' % (name,
' '.join(['%s=%s' % (k, v) for k, v in rule_segment.items()]))
class gp_firewalld_ext(gp_pol_ext, gp_applier):
def __str__(self):
return 'Security/Firewalld'
def apply_zone(self, guid, zone):
zone_attrs = []
ret = firewall_cmd('--permanent', '--new-zone=%s' % zone)[0]
if ret != 0:
log.error('Failed to add new zone', zone)
else:
attribute = 'zone:%s' % zone
self.cache_add_attribute(guid, attribute, zone)
zone_attrs.append(attribute)
# Default to matching the interface(s) for the default zone
ret, out = firewall_cmd('--list-interfaces')
if ret != 0:
log.error('Failed to set interfaces for zone', zone)
for interface in out.strip().split():
ret = firewall_cmd('--permanent', '--zone=%s' % zone,
'--add-interface=%s' % interface.decode())
if ret != 0:
log.error('Failed to set interfaces for zone', zone)
return zone_attrs
def apply_rules(self, guid, rule_dict):
rule_attrs = []
for zone, rules in rule_dict.items():
for rule in rules:
if 'rule' in rule:
rule_parsed = rule_segment_parse('rule', rule['rule'])
else:
rule_parsed = 'rule '
for segment in ['source', 'destination', 'service', 'port',
'protocol', 'icmp-block', 'masquerade',
'icmp-type', 'forward-port', 'source-port',
'log', 'audit']:
names = [s for s in rule.keys() if s.startswith(segment)]
for name in names:
rule_parsed += rule_segment_parse(name, rule[name])
actions = set(['accept', 'reject', 'drop', 'mark'])
segments = set(rule.keys())
action = actions.intersection(segments)
if len(action) == 1:
rule_parsed += rule_segment_parse(list(action)[0],
rule[list(action)[0]])
else:
log.error('Invalid firewall rule syntax')
ret = firewall_cmd('--permanent', '--zone=%s' % zone,
'--add-rich-rule', rule_parsed.strip())[0]
if ret != 0:
log.error('Failed to add firewall rule', rule_parsed)
else:
rhash = self.generate_value_hash(rule_parsed)
attribute = 'rule:%s:%s' % (zone, rhash)
self.cache_add_attribute(guid, attribute, rule_parsed)
rule_attrs.append(attribute)
return rule_attrs
def unapply(self, guid, attribute, value):
if attribute.startswith('zone'):
ret = firewall_cmd('--permanent',
'--delete-zone=%s' % value)[0]
if ret != 0:
log.error('Failed to remove zone', value)
else:
self.cache_remove_attribute(guid, attribute)
elif attribute.startswith('rule'):
_, zone, _ = attribute.split(':')
ret = firewall_cmd('--permanent', '--zone=%s' % zone,
'--remove-rich-rule', value)[0]
if ret != 0:
log.error('Failed to remove firewall rule', value)
else:
self.cache_remove_attribute(guid, attribute)
def apply(self, applier_func, *args):
return applier_func(*args)
def process_group_policy(self, deleted_gpo_list, changed_gpo_list):
for guid, settings in deleted_gpo_list:
if str(self) in settings:
for attribute, value in settings[str(self)].items():
self.unapply(guid, attribute, value)
for gpo in changed_gpo_list:
if gpo.file_sys_path:
section = 'Software\\Policies\\Samba\\Unix Settings\\Firewalld'
pol_file = 'MACHINE/Registry.pol'
path = os.path.join(gpo.file_sys_path, pol_file)
pol_conf = self.parse(path)
if not pol_conf:
continue
attrs = []
for e in pol_conf.entries:
if e.keyname.startswith(section):
if e.keyname.endswith('Rules'):
attrs.extend(self.apply(self.apply_rules, gpo.name,
json.loads(e.data)))
elif e.keyname.endswith('Zones'):
if e.valuename == '**delvals.':
continue
attrs.extend(self.apply(self.apply_zone, gpo.name,
e.data))
# Cleanup all old zones and rules from this GPO
self.clean(gpo.name, keep=attrs)
def rsop(self, gpo):
output = {}
pol_file = 'MACHINE/Registry.pol'
section = 'Software\\Policies\\Samba\\Unix Settings\\Firewalld'
if gpo.file_sys_path:
path = os.path.join(gpo.file_sys_path, pol_file)
pol_conf = self.parse(path)
if not pol_conf:
return output
for e in pol_conf.entries:
if e.keyname.startswith(section):
if e.keyname.endswith('Zones'):
if e.valuename == '**delvals.':
continue
if 'Zones' not in output.keys():
output['Zones'] = []
output['Zones'].append(e.data)
elif e.keyname.endswith('Rules'):
if 'Rules' not in output.keys():
output['Rules'] = []
output['Rules'].append(json.loads(e.data))
return output
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