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https://github.com/samba-team/samba.git
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fce882ab67
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
179 lines
8.6 KiB
Python
179 lines
8.6 KiB
Python
# vgp_access_ext samba group policy
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# Copyright (C) David Mulder <dmulder@suse.com> 2020
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os, re
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from samba.gp.gpclass import gp_xml_ext, gp_file_applier
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from tempfile import NamedTemporaryFile
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from samba.gp.util.logging import log
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intro = '''
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### autogenerated by samba
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#
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# This file is generated by the vgp_access_ext Group Policy
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# Client Side Extension. To modify the contents of this file,
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# modify the appropriate Group Policy objects which apply
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# to this machine. DO NOT MODIFY THIS FILE DIRECTLY.
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#
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'''
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# The deny all file is implicit any time an allow entry is used
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DENY_BOUND = 9000000000
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DENY_FILE = '_gp_DENY_ALL.conf'
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# Each policy MUST create it's own DENY_ALL file if an allow entry exists,
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# otherwise policies will conflict and one could remove a DENY_ALL when another
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# one still requires it.
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def deny_file(access):
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deny_filename = os.path.join(access,
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'%d%s' % (select_next_deny(access), DENY_FILE))
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with NamedTemporaryFile(delete=False, dir=access) as f:
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with open(f.name, 'w') as w:
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w.write(intro)
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w.write('-:ALL:ALL')
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os.chmod(f.name, 0o644)
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os.rename(f.name, deny_filename)
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return deny_filename
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def select_next_deny(directory):
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configs = [re.match(r'(\d+)', f) for f in os.listdir(directory) if DENY_FILE in f]
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return max([int(m.group(1)) for m in configs if m]+[DENY_BOUND])+1
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# Access files in /etc/security/access.d are read in the order of the system
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# locale. Here we number the conf files to ensure they are read in the correct
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# order. Ignore the deny file, since allow entries should always come before
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# the implicit deny ALL.
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def select_next_conf(directory):
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configs = [re.match(r'(\d+)', f) for f in os.listdir(directory) if DENY_FILE not in f]
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return max([int(m.group(1)) for m in configs if m]+[0])+1
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class vgp_access_ext(gp_xml_ext, gp_file_applier):
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def __str__(self):
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return 'VGP/Unix Settings/Host Access'
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def process_group_policy(self, deleted_gpo_list, changed_gpo_list,
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access='/etc/security/access.d'):
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for guid, settings in deleted_gpo_list:
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if str(self) in settings:
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for attribute, policy_files in settings[str(self)].items():
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self.unapply(guid, attribute, policy_files)
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for gpo in changed_gpo_list:
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if gpo.file_sys_path:
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allow = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Allow/manifest.xml'
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path = os.path.join(gpo.file_sys_path, allow)
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allow_conf = self.parse(path)
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deny = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Deny/manifest.xml'
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path = os.path.join(gpo.file_sys_path, deny)
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deny_conf = self.parse(path)
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entries = []
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policy_files = []
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winbind_sep = self.lp.get('winbind separator')
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if allow_conf:
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policy = allow_conf.find('policysetting')
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data = policy.find('data')
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allow_listelements = data.findall('listelement')
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for listelement in allow_listelements:
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adobject = listelement.find('adobject')
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name = adobject.find('name').text
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domain = adobject.find('domain').text
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entries.append('+:%s%s%s:ALL' % (domain,
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winbind_sep,
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name))
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if len(allow_listelements) > 0:
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log.info('Adding an implicit deny ALL because an allow'
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' entry is present')
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policy_files.append(deny_file(access))
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if deny_conf:
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policy = deny_conf.find('policysetting')
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data = policy.find('data')
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for listelement in data.findall('listelement'):
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adobject = listelement.find('adobject')
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name = adobject.find('name').text
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domain = adobject.find('domain').text
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entries.append('-:%s%s%s:ALL' % (domain,
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winbind_sep,
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name))
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if len(allow_listelements) > 0:
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log.warn("Deny entry '%s' is meaningless with "
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"allow present" % entries[-1])
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if len(entries) == 0:
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continue
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conf_id = select_next_conf(access)
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access_file = os.path.join(access, '%010d_gp.conf' % conf_id)
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policy_files.append(access_file)
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access_contents = '\n'.join(entries)
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# Each GPO applies only one set of access policies, so the
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# attribute does not need uniqueness.
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attribute = self.generate_attribute(gpo.name)
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# The value hash is generated from the access policy, ensuring
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# any changes to this GPO will cause the files to be rewritten.
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value_hash = self.generate_value_hash(access_contents)
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def applier_func(access, access_file, policy_files):
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if not os.path.isdir(access):
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os.mkdir(access, 0o644)
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with NamedTemporaryFile(delete=False, dir=access) as f:
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with open(f.name, 'w') as w:
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w.write(intro)
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w.write(access_contents)
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os.chmod(f.name, 0o644)
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os.rename(f.name, access_file)
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return policy_files
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self.apply(gpo.name, attribute, value_hash, applier_func,
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access, access_file, policy_files)
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# Cleanup any old entries that are no longer part of the policy
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self.clean(gpo.name, keep=[attribute])
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def rsop(self, gpo):
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output = {}
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if gpo.file_sys_path:
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allow = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Allow/manifest.xml'
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path = os.path.join(gpo.file_sys_path, allow)
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allow_conf = self.parse(path)
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deny = 'MACHINE/VGP/VTLA/VAS/HostAccessControl/Deny/manifest.xml'
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path = os.path.join(gpo.file_sys_path, deny)
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deny_conf = self.parse(path)
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entries = []
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winbind_sep = self.lp.get('winbind separator')
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if allow_conf:
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policy = allow_conf.find('policysetting')
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data = policy.find('data')
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allow_listelements = data.findall('listelement')
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for listelement in allow_listelements:
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adobject = listelement.find('adobject')
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name = adobject.find('name').text
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domain = adobject.find('domain').text
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if str(self) not in output.keys():
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output[str(self)] = []
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output[str(self)].append('+:%s%s%s:ALL' % (name,
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winbind_sep,
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domain))
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if len(allow_listelements) > 0:
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output[str(self)].append('-:ALL:ALL')
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if deny_conf:
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policy = deny_conf.find('policysetting')
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data = policy.find('data')
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for listelement in data.findall('listelement'):
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adobject = listelement.find('adobject')
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name = adobject.find('name').text
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domain = adobject.find('domain').text
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if str(self) not in output.keys():
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output[str(self)] = []
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output[str(self)].append('-:%s%s%s:ALL' % (name,
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winbind_sep,
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domain))
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return output
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