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# gp_firefox_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
import json
from samba.gp.gpclass import gp_pol_ext, gp_misc_applier
from samba.dcerpc import misc
from samba.common import get_string
from samba.gp.util.logging import log
def parse_entry_data(e):
if e.type == misc.REG_MULTI_SZ:
data = get_string(e.data).replace('\x00', '')
return json.loads(data)
elif e.type == misc.REG_DWORD and e.data in [0, 1]:
return e.data == 1
return e.data
def convert_pol_to_json(section, entries):
result = {}
index_map = {}
for e in entries:
if not e.keyname.startswith(section):
continue
if '**delvals.' in e.valuename:
continue
sub_keys = e.keyname.replace(section, '').strip('\\')
if sub_keys:
sub_keys = sub_keys.split('\\')
current = result
index = -1
if sub_keys[-1].isnumeric():
name = '\\'.join(sub_keys[:-1])
elif e.valuename.isnumeric():
name = e.keyname
else:
name = '\\'.join([e.keyname, e.valuename])
for i in range(len(sub_keys)):
if sub_keys[i] == 'PDFjs':
sub_keys[i] = 'PSFjs'
ctype = dict
if i == len(sub_keys)-1 and e.valuename.isnumeric():
ctype = list
index = int(e.valuename)
if i < len(sub_keys)-1 and sub_keys[i+1].isnumeric():
ctype = list
index = int(sub_keys[i+1])
if type(current) == dict:
if sub_keys[i] not in current:
if ctype == dict:
current[sub_keys[i]] = {}
else:
current[sub_keys[i]] = []
current = current[sub_keys[i]]
else:
if name not in index_map:
index_map[name] = {}
if index not in index_map[name].keys():
if ctype == dict:
current.append({})
else:
current.append([])
index_map[name][index] = len(current)-1
current = current[index_map[name][index]]
if type(current) == list:
current.append(parse_entry_data(e))
else:
current[e.valuename] = parse_entry_data(e)
else:
result[e.valuename] = parse_entry_data(e)
return result
class gp_firefox_ext(gp_pol_ext, gp_misc_applier):
firefox_installdir = '/etc/firefox/policies'
destfile = os.path.join(firefox_installdir, 'policies.json')
def __str__(self):
return 'Mozilla/Firefox'
def set_machine_policy(self, policies):
try:
os.makedirs(self.firefox_installdir, exist_ok=True)
with open(self.destfile, 'w') as f:
json.dump(policies, f)
log.debug('Wrote Firefox preferences', self.destfile)
except PermissionError:
log.debug('Failed to write Firefox preferences',
self.destfile)
def get_machine_policy(self):
if os.path.exists(self.destfile):
with open(self.destfile, 'r') as r:
policies = json.load(r)
log.debug('Read Firefox preferences', self.destfile)
else:
policies = {'policies': {}}
return policies
def parse_value(self, value):
data = super().parse_value(value)
for k, v in data.items():
try:
data[k] = json.loads(v)
except json.decoder.JSONDecodeError:
pass
return data
def unapply_policy(self, guid, policy, applied_val, val):
def set_val(policies, policy, val):
if val is None:
del policies[policy]
else:
policies[policy] = val
current = self.get_machine_policy()
if policy in current['policies'].keys():
if applied_val is not None:
# Only restore policy if unmodified
if current['policies'][policy] == applied_val:
set_val(current['policies'], policy, val)
else:
set_val(current['policies'], policy, val)
self.set_machine_policy(current)
def unapply(self, guid, policy, val):
cache = self.parse_value(val)
if policy == 'policies.json':
current = self.get_machine_policy()
for attr in current['policies'].keys():
val = cache['old_val']['policies'][attr] \
if attr in cache['old_val']['policies'] else None
self.unapply_policy(guid, attr, None, val)
else:
self.unapply_policy(guid, policy,
cache['new_val'] if 'new_val' in cache else None,
cache['old_val'])
self.cache_remove_attribute(guid, policy)
def apply(self, guid, policy, val):
# If the policy has changed, unapply, then apply new policy
data = self.cache_get_attribute_value(guid, policy)
if data is not None:
self.unapply(guid, policy, data)
current = self.get_machine_policy()
before = None
if policy in current['policies'].keys():
before = current['policies'][policy]
# Apply the policy and log the changes
new_value = self.generate_value(old_val=json.dumps(before),
new_val=json.dumps(val))
current['policies'][policy] = val
self.set_machine_policy(current)
self.cache_add_attribute(guid, policy, get_string(new_value))
def process_group_policy(self, deleted_gpo_list, changed_gpo_list,
policy_dir=None):
if policy_dir is not None:
self.firefox_installdir = policy_dir
self.destfile = os.path.join(policy_dir, 'policies.json')
for guid, settings in deleted_gpo_list:
if str(self) in settings:
for policy, val in settings[str(self)].items():
self.unapply(guid, policy, val)
for gpo in changed_gpo_list:
if gpo.file_sys_path:
pol_file = 'MACHINE/Registry.pol'
section = 'Software\\Policies\\Mozilla\\Firefox'
path = os.path.join(gpo.file_sys_path, pol_file)
pol_conf = self.parse(path)
if not pol_conf:
continue
# Unapply the old cache entry, if present
data = self.cache_get_attribute_value(gpo.name, 'policies.json')
if data is not None:
self.unapply(gpo.name, 'policies.json', data)
policies = convert_pol_to_json(section, pol_conf.entries)
for policy, val in policies.items():
self.apply(gpo.name, policy, val)
# cleanup removed policies
self.clean(gpo.name, keep=policies.keys())
def rsop(self, gpo):
output = {}
pol_file = 'MACHINE/Registry.pol'
section = 'Software\\Policies\\Mozilla\\Firefox'
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):
output['%s\\%s' % (e.keyname, e.valuename)] = e.data
return output
class gp_firefox_old_ext(gp_firefox_ext):
firefox_installdir = '/usr/lib64/firefox/distribution'
destfile = os.path.join(firefox_installdir, 'policies.json')
def __str__(self):
return 'Mozilla/Firefox (old profile directory)'
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