File: //usr/lib/python3/dist-packages/samba/gp_gnome_settings_ext.py
# gp_gnome_settings_ext samba gpo policy
# Copyright (C) David Mulder <dmulder@suse.com> 2020
#
# 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, re
from samba.gpclass import gp_pol_ext
from tempfile import NamedTemporaryFile
import shutil
from configparser import ConfigParser
from subprocess import Popen, PIPE
from samba.common import get_bytes, get_string
from glob import glob
import xml.etree.ElementTree as etree
def dconf_update(log, test_dir):
if test_dir is not None:
return
dconf = shutil.which('dconf')
if dconf is None:
log.error('Failed to update dconf. Command not found')
return
p = Popen([dconf, 'update'], stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
if p.returncode != 0:
log.error('Failed to update dconf: %s' % get_string(err))
def create_locks_dir(test_dir):
locks_dir = '/etc/dconf/db/local.d/locks'
if test_dir is not None:
locks_dir = os.path.join(test_dir, locks_dir[1:])
os.makedirs(locks_dir, exist_ok=True)
return locks_dir
def create_user_profile(test_dir):
user_profile = '/etc/dconf/profile/user'
if test_dir is not None:
user_profile = os.path.join(test_dir, user_profile[1:])
if os.path.exists(user_profile):
return
os.makedirs(os.path.dirname(user_profile), exist_ok=True)
with NamedTemporaryFile('w', dir=os.path.dirname(user_profile),
delete=False) as w:
w.write('user-db:user\nsystem-db:local')
fname = w.name
shutil.move(fname, user_profile)
def create_local_db(test_dir):
local_db = '/etc/dconf/db/local.d'
if test_dir is not None:
local_db = os.path.join(test_dir, local_db[1:])
os.makedirs(local_db, exist_ok=True)
return local_db
def select_next_conf(directory, fname=''):
configs = [re.match(r'(\d+)%s' % fname, f) for f in os.listdir(directory)]
return max([int(m.group(1)) for m in configs if m]+[0])+1
class gp_gnome_settings_ext(gp_pol_ext):
def __init__(self, *args):
super().__init__(*args)
self.keys = ['Compose Key',
'Dim Screen when User is Idle',
'Lock Down Specific Settings',
'Whitelisted Online Accounts',
'Enabled Extensions']
self.lock_down_settings = {}
self.test_dir = None
def __str__(self):
return 'GNOME Settings/Lock Down Settings'
def __add_lockdown_data(self, k, e):
if k not in self.lock_down_settings:
self.lock_down_settings[k] = {}
self.lock_down_settings[k][e.valuename] = e.data
def __enable_lockdown_data(self, e):
if e.valuename not in self.lock_down_settings:
self.lock_down_settings[e.valuename] = {}
self.lock_down_settings[e.valuename]['Enabled'] = e.data == 1
def __apply_compose_key(self, data):
attribute = self.keys[0]
old_val = self.gp_db.retrieve(str(self), attribute)
create_user_profile(self.test_dir)
local_db_dir = create_local_db(self.test_dir)
if old_val is not None:
# Overwrite the old policy if it exists
local_db, lock = old_val.split(';')
else:
conf_id = select_next_conf(local_db_dir, '-input-sources')
local_db = os.path.join(local_db_dir,
'%010d-input-sources' % conf_id)
data_map = { 'Right Alt': 'compose:ralt',
'Left Win': 'compose:lwin',
'3rd level of Left Win': 'compose:lwin-altgr',
'Right Win': 'compose:rwin',
'3rd level of Right Win': 'compose:rwin-altgr',
'Menu': 'compose:menu',
'3rd level of Menu': 'compose:menu-altgr',
'Left Ctrl': 'compose:lctrl',
'3rd level of Left Ctrl': 'compose:lctrl-altgr',
'Right Ctrl': 'compose:rctrl',
'3rd level of Right Ctrl': 'compose:rctrl-altgr',
'Caps Lock': 'compose:caps',
'3rd level of Caps Lock': 'compose:caps-altgr',
'The "< >" key': 'compose:102',
'3rd level of the "< >" key': 'compose:102-altgr',
'Pause': 'compose:paus',
'PrtSc': 'compose:prsc',
'Scroll Lock': 'compose:sclk'
}
if data['Key Name'] not in data_map.keys():
self.logger.error('Compose Key \'%s\' not recognized' % \
data['Key Name'])
return
parser = ConfigParser()
section = 'org/gnome/desktop/input-sources'
parser.add_section(section)
parser.set(section, 'xkb-options',
"['%s']" % data_map[data['Key Name']])
with open(local_db, 'w') as w:
parser.write(w)
# Lock xkb-options
locks_dir = create_locks_dir(self.test_dir)
if old_val is None:
conf_id = select_next_conf(locks_dir)
lock = os.path.join(locks_dir, '%010d-input-sources' % conf_id)
with open(lock, 'w') as w:
w.write('/org/gnome/desktop/input-sources/xkb-options')
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), attribute, ';'.join([local_db, lock]))
def __apply_dim_idle(self, data):
attribute = self.keys[1]
old_val = self.gp_db.retrieve(str(self), attribute)
create_user_profile(self.test_dir)
local_db_dir = create_local_db(self.test_dir)
if old_val is not None:
# Overwrite the old policy if it exists
local_power_db, local_session_db, lock = old_val.split(';')
else:
conf_id = select_next_conf(local_db_dir, '-power')
local_power_db = os.path.join(local_db_dir, '%010d-power' % conf_id)
parser = ConfigParser()
section = 'org/gnome/settings-daemon/plugins/power'
parser.add_section(section)
parser.set(section, 'idle-dim', 'true')
parser.set(section, 'idle-brightness', str(data['Dim Idle Brightness']))
with open(local_power_db, 'w') as w:
parser.write(w)
if old_val is None:
conf_id = select_next_conf(local_db_dir, '-session')
local_session_db = os.path.join(local_db_dir, '%010d-session' % conf_id)
parser = ConfigParser()
section = 'org/gnome/desktop/session'
parser.add_section(section)
parser.set(section, 'idle-delay', 'uint32 %d' % data['Delay'])
with open(local_session_db, 'w') as w:
parser.write(w)
# Lock power-saving
locks_dir = create_locks_dir(self.test_dir)
if old_val is None:
conf_id = select_next_conf(locks_dir)
lock = os.path.join(locks_dir, '%010d-power-saving' % conf_id)
with open(lock, 'w') as w:
w.write('/org/gnome/settings-daemon/plugins/power/idle-dim\n')
w.write('/org/gnome/settings-daemon/plugins/power/idle-brightness\n')
w.write('/org/gnome/desktop/session/idle-delay')
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), attribute, ';'.join([local_power_db,
local_session_db,
lock]))
def __apply_specific_settings(self, data):
attribute = self.keys[2]
old_val = self.gp_db.retrieve(str(self), attribute)
create_user_profile(self.test_dir)
locks_dir = create_locks_dir(self.test_dir)
if old_val is not None:
# Overwrite the old policy if it exists
policy_file = old_val
else:
conf_id = select_next_conf(locks_dir, '-group-policy')
policy_file = os.path.join(locks_dir, '%010d-group-policy' % conf_id)
with open(policy_file, 'w') as w:
for key in data.keys():
w.write('%s\n' % key)
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), attribute, policy_file)
def __apply_whitelisted_account(self, data):
attribute = self.keys[3]
old_val = self.gp_db.retrieve(str(self), attribute)
create_user_profile(self.test_dir)
local_db_dir = create_local_db(self.test_dir)
locks_dir = create_locks_dir(self.test_dir)
val = "['%s']" % "', '".join(data.keys())
policy_files = self.__lockdown(local_db_dir, locks_dir, 'goa',
'whitelisted-providers', val, old_val,
'org/gnome/online-accounts')
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), attribute, ';'.join(policy_files))
def __apply_enabled_extensions(self, data):
attribute = self.keys[4]
old_val = self.gp_db.retrieve(str(self), attribute)
create_user_profile(self.test_dir)
local_db_dir = create_local_db(self.test_dir)
if old_val is not None:
# Overwrite the old policy if it exists
policy_file = old_val
else:
conf_id = select_next_conf(local_db_dir)
policy_file = os.path.join(local_db_dir, '%010d-extensions' % conf_id)
parser = ConfigParser()
section = 'org/gnome/shell'
parser.add_section(section)
exts = data.keys()
parser.set(section, 'enabled-extensions', "['%s']" % "', '".join(exts))
parser.set(section, 'development-tools', 'false')
with open(policy_file, 'w') as w:
parser.write(w)
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), attribute, policy_file)
def __lockdown(self, local_db_dir, locks_dir, name, key, val,
old_val, section='org/gnome/desktop/lockdown'):
if old_val is None:
policy_files = []
conf_id = select_next_conf(local_db_dir)
policy_file = os.path.join(local_db_dir,
'%010d-%s' % (conf_id, name))
policy_files.append(policy_file)
conf_id = select_next_conf(locks_dir)
lock = os.path.join(locks_dir, '%010d-%s' % (conf_id, name))
policy_files.append(lock)
else:
policy_files = old_val.split(';')
policy_file, lock = policy_files
parser = ConfigParser()
parser.add_section(section)
parser.set(section, key, val)
with open(policy_file, 'w') as w:
parser.write(w)
with open(lock, 'w') as w:
w.write('/%s/%s' % (section, key))
return policy_files
def __apply_enabled(self, k):
old_val = self.gp_db.retrieve(str(self), k)
if old_val is not None:
# Overwrite the old policy if it exists
policy_files = old_val.split(';')
else:
policy_files = []
create_user_profile(self.test_dir)
local_db_dir = create_local_db(self.test_dir)
locks_dir = create_locks_dir(self.test_dir)
if k == 'Lock Down Enabled Extensions':
if old_val is None:
conf_id = select_next_conf(locks_dir)
policy_file = os.path.join(locks_dir, '%010d-extensions' % conf_id)
policy_files.append(policy_file)
else:
policy_file, = policy_files
with open(policy_file, 'w') as w:
w.write('/org/gnome/shell/enabled-extensions\n')
w.write('/org/gnome/shell/development-tools')
elif k == 'Disable Printing':
policy_files = self.__lockdown(local_db_dir, locks_dir, 'printing',
'disable-printing', 'true', old_val)
elif k == 'Disable File Saving':
policy_files = self.__lockdown(local_db_dir, locks_dir,
'filesaving',
'disable-save-to-disk', 'true',
old_val)
elif k == 'Disable Command-Line Access':
policy_files = self.__lockdown(local_db_dir, locks_dir, 'cmdline',
'disable-command-line', 'true',
old_val)
elif k == 'Disallow Login Using a Fingerprint':
policy_files = self.__lockdown(local_db_dir, locks_dir,
'fingerprintreader',
'enable-fingerprint-authentication',
'false', old_val,
section='org/gnome/login-screen')
elif k == 'Disable User Logout':
policy_files = self.__lockdown(local_db_dir, locks_dir, 'logout',
'disable-log-out', 'true', old_val)
elif k == 'Disable User Switching':
policy_files = self.__lockdown(local_db_dir, locks_dir, 'logout',
'disable-user-switching', 'true',
old_val)
elif k == 'Disable Repartitioning':
actions = '/usr/share/polkit-1/actions'
udisk2 = glob(os.path.join(actions,
'org.freedesktop.[u|U][d|D]isks2.policy'))
if len(udisk2) == 1:
udisk2 = udisk2[0]
else:
udisk2 = os.path.join(actions,
'org.freedesktop.UDisks2.policy')
udisk2_etc = os.path.join('/etc/share/polkit-1/actions',
os.path.basename(udisk2))
if self.test_dir is not None:
udisk2_etc = os.path.join(self.test_dir, udisk2_etc[1:])
os.makedirs(os.path.dirname(udisk2_etc), exist_ok=True)
xml_data = etree.ElementTree(etree.Element('policyconfig'))
if os.path.exists(udisk2):
data = open(udisk2, 'rb').read()
existing_xml = etree.ElementTree(etree.fromstring(data))
root = xml_data.getroot()
root.append(existing_xml.find('vendor'))
root.append(existing_xml.find('vendor_url'))
root.append(existing_xml.find('icon_name'))
else:
vendor = etree.SubElement(xml_data.getroot(), 'vendor')
vendor.text = 'The Udisks Project'
vendor_url = etree.SubElement(xml_data.getroot(), 'vendor_url')
vendor_url.text = 'https://github.com/storaged-project/udisks'
icon_name = etree.SubElement(xml_data.getroot(), 'icon_name')
icon_name.text = 'drive-removable-media'
action = etree.SubElement(xml_data.getroot(), 'action')
action.attrib['id'] = 'org.freedesktop.udisks2.modify-device'
description = etree.SubElement(action, 'description')
description.text = 'Modify the drive settings'
message = etree.SubElement(action, 'message')
message.text = 'Authentication is required to modify drive settings'
defaults = etree.SubElement(action, 'defaults')
allow_any = etree.SubElement(defaults, 'allow_any')
allow_any.text = 'no'
allow_inactive = etree.SubElement(defaults, 'allow_inactive')
allow_inactive.text = 'no'
allow_active = etree.SubElement(defaults, 'allow_active')
allow_active.text = 'yes'
with open(udisk2_etc, 'wb') as w:
xml_data.write(w, encoding='UTF-8', xml_declaration=True)
policy_files.append(udisk2_etc)
else:
self.logger.error('Unable to apply %s' % k)
return
dconf_update(self.logger, self.test_dir)
self.gp_db.store(str(self), k, ';'.join(policy_files))
def __unapply(self, fnames):
for fname in fnames.split(';'):
if os.path.exists(fname):
os.unlink(fname)
def __clean_data(self, k):
data = self.lock_down_settings[k]
return {i: data[i] for i in data.keys() if i != 'Enabled'}
def process_group_policy(self, deleted_gpo_list, changed_gpo_list,
test_dir=None):
if test_dir is not None:
self.test_dir = test_dir
for guid, settings in deleted_gpo_list:
self.gp_db.set_guid(guid)
if str(self) in settings:
for attribute, value in settings[str(self)].items():
self.__unapply(value)
self.gp_db.delete(str(self), attribute)
self.gp_db.commit()
for gpo in changed_gpo_list:
if gpo.file_sys_path:
section_name = 'GNOME Settings\\Lock Down Settings'
self.gp_db.set_guid(gpo.name)
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
for e in pol_conf.entries:
if e.keyname.startswith(section_name) and e.data and \
'**delvals.' not in e.valuename:
for k in self.keys:
if e.keyname.endswith(k):
self.__add_lockdown_data(k, e)
break
else:
self.__enable_lockdown_data(e)
for k in self.lock_down_settings.keys():
# Ignore disabled preferences
if not self.lock_down_settings[k]['Enabled']:
continue
# Apply using the appropriate applier
if k == self.keys[0]:
self.__apply_compose_key(self.__clean_data(k))
elif k == self.keys[1]:
self.__apply_dim_idle(self.__clean_data(k))
elif k == self.keys[2]:
self.__apply_specific_settings(self.__clean_data(k))
elif k == self.keys[3]:
self.__apply_whitelisted_account(self.__clean_data(k))
elif k == self.keys[4]:
self.__apply_enabled_extensions(self.__clean_data(k))
else:
self.__apply_enabled(k)
self.gp_db.commit()
def rsop(self, gpo):
output = {}
if gpo.file_sys_path:
section_name = 'GNOME Settings\\Lock Down Settings'
pol_file = 'MACHINE/Registry.pol'
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_name) and e.data and \
'**delvals.' not in e.valuename:
for k in self.keys:
if e.keyname.endswith(k):
self.__add_lockdown_data(k, e)
break
else:
self.__enable_lockdown_data(e)
for k in self.lock_down_settings.keys():
if self.lock_down_settings[k]['Enabled']:
if len(self.lock_down_settings[k]) > 1:
data = self.__clean_data(k)
if all([i == data[i] for i in data.keys()]):
output[k] = list(data.keys())
else:
output[k] = data
else:
output[k] = self.lock_down_settings[k]
return output