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# vgp_access_ext samba group 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.gp.gpclass import gp_xml_ext, gp_file_applier
from tempfile import NamedTemporaryFile
from samba.gp.util.logging import log
intro = '''
### autogenerated by samba
#
# This file is generated by the vgp_access_ext Group Policy
# Client Side Extension. To modify the contents of this file,
# modify the appropriate Group Policy objects which apply
# to this machine. DO NOT MODIFY THIS FILE DIRECTLY.
#
'''
# The deny all file is implicit any time an allow entry is used
DENY_BOUND = 9000000000
DENY_FILE = '_gp_DENY_ALL.conf'
# Each policy MUST create it's own DENY_ALL file if an allow entry exists,
# otherwise policies will conflict and one could remove a DENY_ALL when another
# one still requires it.
def deny_file(access):
deny_filename = os.path.join(access,
'%d%s' % (select_next_deny(access), DENY_FILE))
with NamedTemporaryFile(delete=False, dir=access) as f:
with open(f.name, 'w') as w:
w.write(intro)
w.write('-:ALL:ALL')
os.chmod(f.name, 0o644)
os.rename(f.name, deny_filename)
return deny_filename
def select_next_deny(directory):
configs = [re.match(r'(\d+)', f) for f in os.listdir(directory) if DENY_FILE in f]
return max([int(m.group(1)) for m in configs if m]+[DENY_BOUND])+1
# Access files in /etc/security/access.d are read in the order of the system
# locale. Here we number the conf files to ensure they are read in the correct
# order. Ignore the deny file, since allow entries should always come before
# the implicit deny ALL.
def select_next_conf(directory):
configs = [re.match(r'(\d+)', f) for f in os.listdir(directory) if DENY_FILE not in f]
return max([int(m.group(1)) for m in configs if m]+[0])+1
class vgp_access_ext(gp_xml_ext, gp_file_applier):
def __str__(self):
return 'VGP/Unix Settings/Host Access'
def process_group_policy(self, deleted_gpo_list, changed_gpo_list,
access='/etc/security/access.d'):
for guid, settings in deleted_gpo_list:
if str(self) in settings:
for attribute, policy_files in settings[str(self)].items():
self.unapply(guid, attribute, policy_files)
for gpo in changed_gpo_list:
if gpo.file_sys_path:
allow = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Allow/manifest.xml'
path = os.path.join(gpo.file_sys_path, allow)
allow_conf = self.parse(path)
deny = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Deny/manifest.xml'
path = os.path.join(gpo.file_sys_path, deny)
deny_conf = self.parse(path)
entries = []
policy_files = []
winbind_sep = self.lp.get('winbind separator')
if allow_conf:
policy = allow_conf.find('policysetting')
data = policy.find('data')
allow_listelements = data.findall('listelement')
for listelement in allow_listelements:
adobject = listelement.find('adobject')
name = adobject.find('name').text
domain = adobject.find('domain').text
entries.append('+:%s%s%s:ALL' % (domain,
winbind_sep,
name))
if len(allow_listelements) > 0:
log.info('Adding an implicit deny ALL because an allow'
' entry is present')
policy_files.append(deny_file(access))
if deny_conf:
policy = deny_conf.find('policysetting')
data = policy.find('data')
for listelement in data.findall('listelement'):
adobject = listelement.find('adobject')
name = adobject.find('name').text
domain = adobject.find('domain').text
entries.append('-:%s%s%s:ALL' % (domain,
winbind_sep,
name))
if len(allow_listelements) > 0:
log.warn("Deny entry '%s' is meaningless with "
"allow present" % entries[-1])
if len(entries) == 0:
continue
conf_id = select_next_conf(access)
access_file = os.path.join(access, '%010d_gp.conf' % conf_id)
policy_files.append(access_file)
access_contents = '\n'.join(entries)
# Each GPO applies only one set of access policies, so the
# attribute does not need uniqueness.
attribute = self.generate_attribute(gpo.name)
# The value hash is generated from the access policy, ensuring
# any changes to this GPO will cause the files to be rewritten.
value_hash = self.generate_value_hash(access_contents)
def applier_func(access, access_file, policy_files):
if not os.path.isdir(access):
os.mkdir(access, 0o644)
with NamedTemporaryFile(delete=False, dir=access) as f:
with open(f.name, 'w') as w:
w.write(intro)
w.write(access_contents)
os.chmod(f.name, 0o644)
os.rename(f.name, access_file)
return policy_files
self.apply(gpo.name, attribute, value_hash, applier_func,
access, access_file, policy_files)
# Cleanup any old entries that are no longer part of the policy
self.clean(gpo.name, keep=[attribute])
def rsop(self, gpo):
output = {}
if gpo.file_sys_path:
allow = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Allow/manifest.xml'
path = os.path.join(gpo.file_sys_path, allow)
allow_conf = self.parse(path)
deny = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Deny/manifest.xml'
path = os.path.join(gpo.file_sys_path, deny)
deny_conf = self.parse(path)
entries = []
winbind_sep = self.lp.get('winbind separator')
if allow_conf:
policy = allow_conf.find('policysetting')
data = policy.find('data')
allow_listelements = data.findall('listelement')
for listelement in allow_listelements:
adobject = listelement.find('adobject')
name = adobject.find('name').text
domain = adobject.find('domain').text
if str(self) not in output.keys():
output[str(self)] = []
output[str(self)].append('+:%s%s%s:ALL' % (name,
winbind_sep,
domain))
if len(allow_listelements) > 0:
output[str(self)].append('-:ALL:ALL')
if deny_conf:
policy = deny_conf.find('policysetting')
data = policy.find('data')
for listelement in data.findall('listelement'):
adobject = listelement.find('adobject')
name = adobject.find('name').text
domain = adobject.find('domain').text
if str(self) not in output.keys():
output[str(self)] = []
output[str(self)].append('-:%s%s%s:ALL' % (name,
winbind_sep,
domain))
return output
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